Here’s a GoPro mount for your kite board fin plate (needs a brass insert for the thumbscrew)….
and here’s a board leash for those of us who ride in places where a leash is useful – again, attaches where the fin plate would be…
https://www.shapeways.com/product/VTFKC2G8H/kitesurf-board-leash-point-fin-plate?optionId=66433502