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.