I think it will take out of the box thinking. Something that will bypass all the old restrictions and do it in a new separate way for RealTimesSignatures.
There are so many things tied into the current 4 beats like the Micro chord dialog.
That's why I think the BBPlugin is a better way because if they are moving all the generate code into the Plugin (rather than bbw4 running in the background) they can get rid of all the restrictions and have any time signature, decimal tempo maps and way over 255 bars.
I can do it in Reaper, it will fit any tracks recorded at any time signature.
This is a 6/8 track:

Zoom++


https://stash.reaper.fm/u/ReaTrak (Scripts for Biab Reaper)
Open SGU in Reaper Instantly