Grenadiers have smallest squad size what makes re-crewing weapons extreamly funky. Even if your team dropped one model they canot pick up a weapon (unless you want your squad gone.)
Some sicuations become really akward where you kinda need to grab that pak but at the same time it feel stupid to lose vet 3 unit just to secure it.
Technicly Osteer has larger teams but they are all doctrine explusive.
My solution is very simple. Squads with max number of models of 4 recrew weapons with 2 models not 3.
This could also be applied to soviet enginiers, sturmpio and US echlon troops.
In the case of the british I am not sure how it would affect the game balance.
This is already implemented in some single player missions.