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Well, color me surprised but I've managed to do something. Apparently the Skull Mask nd the Inika masks fit together almost perfectly. That's the gold Kulta mask under the Calix, no glue or other heresy required. I have tried the other G2 masks and they're too wide or have weird protrusions that don't work with the Inika masks.
The Calix and the Suletu are the easiest to apply. The Kadin is a bit harder but nothing bad. The Iden is a bitch to get to work and wobbles a bit (but my Iden is probably too loose). The Sanok just doesn't work due to its weird wide chin. Can't find where I put my Elda, but man fuck the Elda.
If anyone is curious I have more pictures, with Kopaka, Kongu and Onua wearing the masks.