Love the throw lever idea. I just bought a bino clamp from Aziak Equipment to tripod mount my Leica's and i'm pretty sure they just 3D print them.
https://www.aziakequipment.com/product-page/bino-clamp
Minus nearly putting a nail through my foot, I've been quite successful perusing construction sites and digging ends of rolls and pieces big enough to use for footprints out of newly built house construction dumpsters.