It is possible to use the electronic shift case. The 4406 swap thread at explorer forum has more details on that. If you do look for an electric shift case, be absolutely sure you get one that isn't control trac.
My suspicion is that if you're swapping from a 1354 electronic shift case controlled by the GEM that it wouldn't really be that hard to make it work, but it wasn't worth it to me compared to a reliable lever to pull.