Yeah you can build geoswitching into the original figure.. you'll need to provide a new cr2, and also new obj files as well.

Since your new feet have more groups, that will become the "base" figure geometry.. and you'll then have the feet from your original figure as partial geometry, that can be switched to.

You'll want to import your new mesh, then in the setuproom import the original skeleton, add the additional bones, save that figure, and then move your morphs and fbm and erc stuff into your new cr2. Once you have all the original stuff working, then add the geoswitching for the new hoof feet.

It's not work for the squeemish, but it's the best way to approach the project.

Way too many people take way too many things way too seriously.