I'd increase cost to 60 muni and give like -10% RA bonus and -10% reinforcement cost. Would make them a bit more cost effective on their own, while making initial cost higher.
I'm happy to see a lot of great points made in this thread about how to make the g43s better. This one particularly made by derbyhat would in my mind fit the supposed role of g43s perfectly. I'm totally on the side of g43s getting their cost increased and getting a small buff if they remain at 2cp.
Another possible way to make them better without us seeing blobs of g43s that came to my mind would be to mirror the properties of other scoped axis weapons like JLI g43s and obers infra stgs: Just slightly boost the accuracy against units behind cover. Opponent would be punished for trying to engage in static warfare at medium range and would be forced to either advance to the short range or withdraw to gain more favourable engagement. This would finally make use of that dps on the move speciality as they could chase after the withdrawing units.