Though this is kind of skirting the issue, if you're up to the job of a good top carve and rebinding, you could easily incorporate the maple into a scratch built Les Paul. If you're not, and this is an attempt to simplify the project, forget it.
The basic question is - What do you gain by retopping rather than building from the ground up?
A scratch build would be no more difficult, quite possibly easier, and won't risk butchering an existing guitar. Aplogies if I'm dirrecting this at a very experienced builder, I'm a Noob on this board, so I don't quite have a handle on all the regulars levels of competance...
-Setch.