I spent A LOT of time making toe-strap fixings for clipless pedals a couple of years ago. After dozens of prototypes, I feel like I had really solid designs for both LOOK KEO MAX 2 and Dura Ace pedals. Then I ran into the limitations of the materials. Because of the nature of the process, they were prone to sheering between the layers if the stress were enough.
I reached out to a company that could take my files and make 3D prints using metal (which would have been an upgrade), but family and work stuff took precedent and I lost steam.
I even had an idea for a chain tensioner that would be faster to use than screws...but also lost steam.