I don’t meant to keep bugging you about this one, but seems to me it should be easy. Once you said something about wanting to be able to indicate that the tune or key was in a modal place. But that may be over thinking it. Where you have “show more types” in chord choices you could just include “no third” or “5 chord” and render it with 2 five notes or however it sounds best. It doesn’t have to relate to anything else to be useful.
But great update. I appreciate it very much. Happy New Year!