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Not the most practical approach but they certainly have uses to me

Polygon Islands compounds by Guillaume Laforge can be found at http://rray.de/xsi/ with the search term: Polygon Islands Transform.

Files found in attachment or here: https://www.dropbox.com/s/q4nox06h4gepx ... lities.zip

NOTE: I show a procedure in the Copy compound to restrict deformers to 1, but if you notice the files there's another compound, pb_MaxDeformers. So I decoupled it and now supports n deformers and works like seen here:

Seems like a great way to reliably mirror weights and to attach meshes to envelopes, which can typically be pretty painful.

Thanks!!

Many thanks