What is above the wing where it mounts on the fuse? Perhaps you don't need to fully bury the tank in the wing. Maybe it can sit on top. In my (deceased) Pica FW190-D9 I had the tank fitting between some ribs (lengthwise not crosswise) and about half buried into the wing.

As to quick disconnects I have used them for some time without any problems so putting it in the fuse should work as well.

cheers

Jeff