This sounds like a cool idea, but USF aura heal is really good and you wouldn't want to risk it. Though I would recommend to put medics into your (team game) allies' base. Brits for example could use medics in their base. You swap a wounded RE squad in, no ned to reinforce since ambo only takes two (?) crewmen and you put your medics into your brit friends' base. Brit heal sucks, because you need to have a medic section with the other units that need to be healed. Also there is no risk of mismicro for the brit, since its not his own medic so he doesn't control it.
Personally I think the British healing is actually on the strong side. Being able to heal your Infantry Sections on the field, increasing longevity of the squads. However, it would be nice if you could provide healing to their Royal Engineers and non-vet 3 Commandos with your now spare medics.

United States