I adapted the M7 43, 65, 80 and 150 lenses to use with an Alpa FPS + IQ180.
For that purpose Mamiya Germany in Munich disassembled the central shutter (and replaced it by a small spacer ring as far as I recall). The aperture can be closed manually. I purchased also a M7 camera mount as spare part to build a mount adaption to the Alpa. Mamiya also removed certain unused mechanical parts around the back barrel because the 43 and 65 back lenses dive quite deep into the camera due to their symmetrical design.
My hope was that also a certain amount of shift would be possible, which the very large image circle of the lenses would allow to. But the 43 and 65 quickly show smeared corners and strong lens cast.
On the Fuji GFX with the smaller 44x33mm sensor and no shift, I expect all lenses to work optically very well, if one achieves to remove the central shutter and designs and produces a lens mount adaption with correct flange distance.
here you can find some pictures of the converted lenses
https://www.christoph-kuegler.com/conversion
(thx Satrycon, now I see you shared a link to my previous post about that topic)