Profile of nee

I would have just made it a 0CP call-in for a number of USF commanders.

Or even made it a Fighting Position upgrade; upgrade it to mortar position, and any unit you put in will fire mortars.

1 CP - Forward Receivers
3 CP - Infrared StG Package
6 CP (Up for debate) - Infrared sights for Panther
Now historically, the Panther did have an Infrared sight, and if this were to be an upgrade, it would be around, 80 munitions. It removes the ability to have a MG42 on top. The sights work be allowing the Panther to have a small circle around it, a little further than it's range, and will be able detect units in the area.
10 CP - ME 262 strafe
Honestly if anything, Relic should put this in the game. The main reason being is that they already have the unit quotes for an ME 262 strafing run. Now it should be a very simple strafe. A jet comes over, strafes with 30mm cannons, damaging/destroying light vehicles and killing/surpressing infantry. Should cost around 200 munitions. Also can not be called inside enemy base sectors.
12 CP - V1 rocket?
Now this would work similarly to the Ostheer's railway gun, where there a huge explosion and destroys everything in a certain area. Also can not be used inside an enemy's base. Now it would be 250 munitions and pratically be the same as Coh1's V1 rocket.

Seems a bit too reliant on munitions abilities, it's almost Close Air Support clone.

Infrared Sights is a nice idea and indeed historical, but it only affects Panther, which is a T4 tank; alongside Obers' IR MP44s, this means the commander is pretty much late-game, and not late-game as in calling in Jadgtigers, but late-game as in it's for buffing T4 units.
I would say the Infrared Sights idea is much better for an Ostheer commander, as they don't a stock IR tracking unit.
I take it you want Me-262 strafe to be basically immune to anti-air? The 262 was a fighter aircraft, there's a reason why strafing for ground support requires the plane to fire a little slower, not faster. The Stukas were refitted with 30mm guns for that reason: fighters remain fighters while defunct divebombers are re-purposed.
I once considered the Me 262 for an air denial ability, but that means it's heavily reliant on the opponent to pick a commander featuring aerial call-ins. USF's major can call air recon, but not everyone uses that ability. Are Pathfinder/ Airborne paradrop planes able to be shot down at all??
If I am reading sources correctly, the V-1's payload was 1000kg, about the same payload as Stuka Dive Bomb ability. I made a commander idea where V-1 was basically OKW's version of the Stuka bomb, but shows the V-1 rocket in minimap so your opponent has a chance to escape the kill zone: the blast and damage would be identical to Stuka bomb given the similar explosive payload- the Vengeance weapons weren't exactly WMDs.
All that to say, I like the ideas, but not in this combination. Maybe replace jet fighter with Jagdtiger, or Forward Recievers with Panzerfusiliers? Some of the vanilla unlocks are still good to be re-used; I mean of all abilities, Thorough Salvage was recycled (hur hur) in one of the latest OKW commanders.

I'm not a fan of making up a new stock unit just to fill the AT infantry role. Sturmpioniers is bloated with roles, but their high cost prevents blobbing as much as Panzergrenadiers, which for their part do less work and are a T2 unit.
Besides going back to Volks, the only other choice is Obers, which come too late at T4.

They clearly compensated by making Rak43 pretty much equivalent to any actual AT Gun though, I'm still getting used to treating it with longer range, it feels like you're firing a pistol only to have it shoot like a rifle. Relic clearly wants OKW to use team weapons over infantry blobs.
Now it's USF's turn to become Soviet/ UKF clone. Patch 2017 here we come!

You can't get both upgrades at the same time? That's dumbtarded, yo

Yes you can, so far anyways.

You just need to select the other upgrade before the first one is finished, otherwise the option would disappear. So if you got 110 munitions, you upgrade panzerschreck and wait for munitions to get to 30, then select minesweeper. If you time it right, the game won't lock out minesweepers.

Yes, it does require you to commit more munitions into a single unit in a timeframe, but the end result is a Sturmpionier squad with both upgrades.

IMO I think it's okay, you're just concentrating more munitions into a unit that is either going out attacking tanks, or staying put to repair stuff; either way, you've committed munitions for mutually exclusive roles: you can't repair stuff, take on infantry and take on tanks all at once. And even if you could, you're making them perform three roles where other units can manage two of them. That's considerable risk in munitions investment and tactics just to have a unit fill more roles. The only real problem is that, of the three roles Sturmpioniers can fill, their initial role of StG44s can be replaced by another unit.
And if you're holding back munitions for the dual upgrade, you're also holding back 120 munitions per squad from other things like panzerfaust/ StG44 upgrades.
And of course if you're short on munitions, you're forced to choose one or the other and be forced to spam Sturmpioners to fill a greater role.

In that regard being able to get both is fine to me, they already cost munitions on a unit that can't to all of them at once and itself is expensive. It's either that or Sturmspam.

I'm not fan of reading long text, so could please discuss one thing at a time?

About why I want Ostheer to skip tier2, I feel that splitting the battle phase upgrade and building is extremely redundant. I want to improve so Ostheer player has a choice.

Ostheer was able to skip tier, in the past, when tank come much faster. Nowadays, I almost didn't see any ostheer player risk to skip tier 2, and if they do, they ripe disaster. Very few success so far.

It sounds like you don't so much like to skip tiers but rather take out the additional micro in researching battle phases. Which I would approve, Relic can always just carry over the manpower and fuel costs onto the tier buildings to compensate. Soviets pretty much have this setup: T3 is a whopping 120 fuel (and takes forever to build), and the fact you need to build it before going on to T4 pretty much makes this the same result compared with Ostheer, which just splits resource and time between battle phases and construction.

As for Ostheer skipping tiers for going tanks, I believe the entire point of the changes by Relic was precisely to prevent that, they've always being trying to make pre-tank fighting to last longer.