Good plan. Check out the Ghost 42/43 Pro connector.
As far as the 938, they were too busy jacking the Colt Mustang to come up with something logical. Sig is a primary example of a company that only performs 80% of their own R&D to ensure that a concept basically works and won't explode, then sit aside enough warranty funding to allow the customers to finish the rest of the R&D for them, and they save money. There's a lot of sore MCX owners out there.