Personally I would have one made in a .375 H&H Magnum and there is NO reason to exclude it from African hunting! It should be able to be fitted in the action OK with some modifications.

A 9.3x64 would be similar and a great substitute.

8x68S, yes.

Another idea would be to stock one as a light weight Mannicher-Schoenauer full stock styled rifle, maybe in a classic medium cartridge such as 7x57, 6.5x57, even a 8x57mm.