How about if we can swap boosters around if you have too many of one type of booster and not enough for another?
Like swap them on a 3:1 basis, so if you want/need a medic pack you could swap 3 rests/morale for 1 of the medics.
if you want/need a rest pack you could swap 3 medics/morale for 1 rest pack.
if you want/need a morale booster you could swap 3 medics/rests for 1 morale booster.
I think a booster swap shop could be an idea so unneeded boosters could get used up.