The folks in 3d printing helped me out greatly with this, and I was able to mash this together today. I haven’t printed or tested it yet, but it’s designed to be used with the quad mag ring. I’m going to use some very thin and strong 3m adhesive tape I have to ensure it is secure to the phone, and use for a quadlock mount on the bike if it actually works.
Perhaps this niche case will be useful for someone else?
If it breaks I will try to print out of petg. I may have to print somewhere else, because the printers I have access to I’m only allowed to print PLA AFAIK. I’m hoping the skin (besides looking cool - it’s an xray image of the phone) also reinforces and buffers any impact/fall.