In my testing so far (with V2->Antonia), the above seems to work really well, btw - no more (or at least a whole lot less) piggy-backing... much less for the Restore Details script to clean up.

Of course you might want to make it an option that can be disabled if desired.  When you've had a chance to play with it, come back and tell me again why more than 3 weighted vertices are needed :) (speaking of which, if you look at the output files, you can pretty much tell which verts failed the ray-cast test... they'll be the ones listed with 5 influence verts instead of 3).

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