Agreed, maybe if Signal Relay is combined with something else...
But I also think that the PFs should be given more utility in the form of a vehicle only repair package? I mean, in Breakthrough you have their flares to use in a combination with the JT, in the USF Mech Company Cav rifles are pretty beefy when around vehicles with combined arms on, in Elite Armor if nothing is done for the repair ability then maybe this could be the answer, I would still prefer the Soviet crew repairs any day of the week tbh.
I like the idea of adding Panzerfusiliers into Elite Armor. This would instantly give the team a chance to change that unit's problemetic usage (I'll explain below*).
Panzergrenadiers call-in would be another option as that would give the OKW a much-needed option for proper hand-held AT (a strategic choice in the current TD meta that OKW otherwise doesn't have).
Perhaps the Pgrens/250HT call-in can be used.
Signal relay could perhaps be added to the Panzer Commander or Emergency Repairs (turn it an improved vehicle package ability). In that case maybe trade the map-wide aura for a vicinity-wide aura around the vehicle.
*Panzerfusiliers are awkward to use because over time they have been nerfed to mainline infantry which isn't bad, but they still have a relatively high CP (2) requirement. You want them as an alternative to Volks, but you can't get them until 2CP. This creates awkward build orders as you need Volks for the early game but then you don't have room left for Panzerfusiliers.
I would like to see them changed to 0-1CP so they can become a strategic choice: Panzerfusiliers start with the AT-grenade unlocked and need tech for the AI grenade. Volks start with the AI grenade and need tech to unlock the Panzerfaust. Panzerfusiliers would be great when early light vehicles are expected. Volks would be the choice if mainly infantry is expected.