+1 for magnets -stef
Kept looking at your drawings ; came up with a Hybrid, from watching yours, get pulled apart, & put
back together again .
It's from an old snow-ski binding :
Machine a round end, to a 6mm round SS rod ; the other end is tied to one end of the foot-strap
Machine in a 5mm , 1/3 radius groove, at the top of the round end ; that a 5mm SS ball could
fit into the groove.
Insert this into a carbon block, that had a 5mm flat-head machine screw , with threads molded in ,
(yea , you can do that) directly lined up with that groove.
Place a Strong spring , between a 5mm SS ball, and the machine screw.
The ball in the grove, with the spring driving the ball into it for tension, would keep the foot strap in place ; and it's adjustable.
If it had a Wide head ; it could be put back with one hand, and your fist, to drive it back into the hole. I can
remove, the front of my ski-binding , with one hand , and a Hard hit .