I think the big factor there is that you'd have to wait over a decade for the transplant to be the correct size. I'm also not sure that we have the technology to keep a brainless body alive for such a long period - the brain is involved in a large number of processes that we don't yet have a way to replicate. And then you'd need a complex surgery to perform the transplant.

Pluripotent cells work fine in many animals with no apparent problems and avoid all of the issues with the clone approach. If pluripotent cells turn out to cause problems, then we could always engineer a kill switch to make sure they die off after the limb is regrown.