I have one of the adapters somewhere sort of a tricorn thing with metal pegs like the tripod legs at each tri , too small for the cameras I have , and I cannot see how they would fit into the ring lugs, the wooden legs fit by being under compression and have a metal wedge locking each top pair of struts they are very secure , does make the whole lot resemble a large set of bagpipes .
I remember you could get tables to pop projectors onto tripods bit bulky, Would need to be very careful using any screws into the base of the camera very high risk of splitting so I would drill through and bolt , or clamp from the inside.
For me I am happy to use the original legs as I have got the hang of attaching the extended legs to the closed camera but it is a fiddle if on the move to multiple stations as carrying the attached camera and legs is not practical.