Still each mainline inf has AT nades behind a requirement.
Sovs pay fuel and manpower without getting a reward besides the nades
Ostheer pays fuel and manpower and gets T2 (but pays more than UKF for T2)
OKW needs a Truck
USF needs Vet 1
I don't see the point why Sappers are not suitable for the AT nades. UKF is usually the first army to tech to T2 (mostly on par with Ost skipping T1) and at this time, there is no need for AT nades. The only German vehicle at that moment of time is a Kübelwagen that can be taken out by small arms fire.
Ostheer has practically no requirement, even if you go for Osttruppen you gonna build ether T1 or T2 and you get the Faust with no cost.
As for IS getting the snare, they can have it also at Vet1 even Vet2 (like USF) or after you tech T2-3 (like Ostheer as you said).
You can find good solutions, its not that hard.
I want my RE doing what they suppose to do and not chasing after light Vehicles or Tanks.
Anyway, i have said enough about this topic (made a thread 2 weeks ago).