Jumping in on the Busemann Biplane, a key point to it is that it has no boom at 0 AoA (Angle of Attack) as soon as it would deviate from 0 AoA there will be Booms, and the flow between the two planes will get nasty (to use a very technical term). As far as model rocketry goes, It would be very difficult to build these while holding the tolerances one would need.
Finless stability is often achieve through rotation, bullets, footballs, some satellites, and some launch vehicles/rockets. Tube fins and ring fins work on the same principle as fins when deflected from 0 AoA they create lift. Cone rockets create lift off of 0 AoA but drag is likely a bigger player than in other methods.
Michael NAR# 89304
Somewhere, something incredible is waiting to be known. — Carl Sagan