F35 - EF mount, Nikon F or C/Y mount converting

It is possible to convert the F35 mount to Canon EF or Contax /Yashica mount without unreversable damaging a genuine PL mount? I learned from this forum that this is possible for Nikon F mount.
I assume the outside diameter of EF mount could be too big for such a conversion (as far as I know Arri PL has 54mm inner diameter). Any idea how to pass over?
What about converting to Contax /Yashica mount? It should be done easier.
 
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