Do you have a problem with their height? Can't you stake them and tie them to stop them falling over? I don't think it would be a problem and you might get more fruit bushing out from new growth but then again I grow them in pots and let them do their own thing.

Yeah, you can pinch the tips out to make them bushier

I don't bother now, they seem to split into branches naturally both the grill and the bell peppers