Obers need the panzerschrecks.
Would this make OKW more like Ost? Yeah, pretty much.
But what could be done is that OKW could become a clone of CoH1 Wehr. They're almost there.
Obers in the Medic Truck able to schrecks, swap the walking stuka with the JP4. It'd be a linear, but flexible progression of OKW tech. (And the MG34 can go and die somewhere alone. Or go T0.)
Ostheer just need to have their pgrens come with rifles, a Tiger with frontal armor, and a Panther that either shoots faster or aims better on the move. The StuG is their flavor and backbone. It could potentially use a small health or frontal armor buff, but that's probably unnecessary.
Then the inevitable will be complete. Let the Ostheer be about StuGs and suppression, the OKW about the Luchs rush versus a defensive role with medics, stronger infantry, and indirect fire.
...At least as far as the Axis are concerned. USF is a whole other can of beans. CoH2 is a tangled web of half-balanced half-broken designs.
If I'm just being all nutty and crazy with my thoughts, OKW units could be locked at vet 3, and vet 4 and 5 could be side upgrades for infantry and vehicles respectively.
