A Kia Sportage is the only source of North American FE3s. Otherwise, you'll have to import one, and chances are it'll be FWD configuration anyways. Better off getting one out of a Sportage, that way you have the RWD transmission already.
you, in theory, could. The problems would be witth the custom driveshaft, linkage, mounts and all the other shizzle you would have to fab to make it work. To mutch for a cheap KIA tranny. The RX7 idea is a strong substitute, coupled with a Ford 9" rear end, makes for a tough Mazda B2200