I'd prefer avoiding bolster clones like UKF. Bolster has been a balancing problem since release with IS either being garbage or super strong. Maybe better vet 3 bonuses or something for grens so they can still keep up with WFA squads late.
We have this fancy and underutilized "battle phase" system in Ost teching. We could have idk BP2 unlock a slight damage reduction to make them less prone to wipes