We did Option A.
The air taxi service had a cooler that our caribou hung in until we got flown out. We loaded the meat on a tarp in the back of the van, covered it with another tarp and covered that with bags of ice. Drove like hell for Anchorage. Butchered the meat in a city park, wrapped it and loaded it in wax boxes. Cut the skull plates on the antlers and loaded them in boxes we got from a bike shop.
The Anchorage Airport has a freezer so we dropped off everything as soon as it was cut and let it freeze solid. Caught our flight the next day and paid (I think) about $350 in baggage fees (after our two free bags for being Alaska card members).
This was our antler box. Two bicycle shipping boxes taped together with Gorilla Tape.