Ostheer's got no light tank. That's part of its design, and means it needs to field infantry counters to light vehicles.
The best one it has against lights is Panzershreck PGrens, but these are 100 munitions. If you're on the back foot, that can be a problem.
If I recall correctly, Relic's previous solution to this was to make the Panzerschreck upgrade two parts: you'd buy one Panzershreck for half the cost, then you'd buy the next. This created an inevitable problem of one-Panzershreck PGren blobs, so they got bundled together.
But that ability to buy lesser AT for less munitions and fully upgrade later was a neat feature that could be worth bringing back.
- What if PGrens could get two Panzerbusche AT rifles (they're in the campaign) for 50 munitions? They're much less effective than shrecks, but they do the job on the cheap.
The PGrens could then upgrade those AT rifles to Panzerschrecks for another 50 munitions.
As my friend SneakEye, I think the idea is good but has to be carefully tested for the sake of effectiveness, yes.
But! A big BUT! What about the fact that Germans didn't use Panzerbuche at '44-'45? Or there is historical proof they did? Just this aesthetic part of the upgrade makes it a bit...weird.
And yes, if it's an AT RIFLE, how hard will be for them to hit infantry with them? Because if those are going to be as inaccurate as the Shreck that's not going to be any better, except for being more early. Just the thing is that PZGs have to be an effective Anti-Infantry unit until the Upgrade to become clearly Anti-Tank, yes, BUT, if it's earlier game, as why you've suggested this idea, the infantry still plays a HUGE role in that part of it, and they just have to be still effective against infantry at that specific match period.