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You can buy the plastic bit that grips the garmin separatly.
So you just need to 3D print a few off. I've not had much Luck With 3D printed Mounts though. But then I torque everything to cracking point then back off half a turn.
I had Access to a 3D printer when I was looking. But couldnt find a file for one. What you need is a clever person to modify one of the many clamp based Mounts in the free 3D file Library.
I am cheerfully ignorant of the work required here, but given that Tilquist has exited this market it would seem that someone like Mitre Tester, with his tame CNC machinist and design chops might do well in the "boutique Garmin mount" arena.