Degenerate huh? smile
I was thinking about something similar too, but in slightly different angle.
To "generate a copy" straight to another track (Utility for example) or even better to "first available empty track", if they will have same functions as legacy tracks. That way you can hear both generations without having to re-generate anything and if you like parts of one and parts of other, you can keep both and mute things you do not want.... or delete one ... or..

Merge two tracks into one... keeping all the bar settings of each. With some kind of easy, "user friendly" mechanism. Select tracks right on mixer-> right click> merge selected.