there was a drift integra that ran a B series in the states that ran some crv and custom parts to allow it to be 4WD and RWD from memory but it wasn't cost effective or really done easily, that said it can be done, but then so can almost anything with enough money.
The s2000 half cut i guess the only places to try would be tuners like akmotorworks who get half cuts in or the wreckers who by chance might have a rearended s2000 or something to that effect.