These two YouTube clips show a very unusual mast stepping arrangement - a framework not unlike the one sometimes used to hold up Christmas trees in my youth - which might be a useful addition to the range of possibilities for small junk rig boats. Might solve some problems for those who can’t get the mast stepping needs of a JR to work with the shape of their boat? I have no other information than what is in the videos
The photo is a screen grab from the videos
https://youtu.be/6vNtklr4W04
https://youtu.be/T6vP-b-LyKE