I think George Aldrich showed me one of the handles like you mention. Also I have somewhere an Aeromodeller with instructions for making one. I think they were home builts and not very successful. When monoline first came out the FAI speed rules wouldn't allow the conventional monoline handle. This has since changed. Whether you can still get monoline stuff from Stanzel, I don't know. I'm sure if you go the a speed site you can find the conventional monoline stuff.

Joe Kirn flew a monoline Old Time Stunt airplane at the 2000 VSC and did very well.