I do a little the same but very low tech.
Thru holes in home made carbon boards using 5 mm ss, inox screws and wing nuts on top with star lock washers.
Rounded heads on bottom with wide flat washer, and anti crush carbon tube inside board hole.
I do this on an older board to test stance spacing and various dense foam foot hook ideas as well as straps.
Does take some time to instal, change and one needs to clean sand with fresh water.
Also needs screw driver and strap padding over wing nuts and recessed holes for hard foam foot hooks.
I sure like your idea as is fast but one needs to be very sure where placement is BEFORE loxx placed.
I also like idea of much wider strap spacing and stiff straps.
All this said I find myself strapless, foothookless most of the time as do not jump so much or race.
Great thinking outside the box to mount rear strap, rear hole using inside location, I will test this!