Two easy solutions to this.

1. If you have a complex song that you're experimenting with use a midi style to start. Midi generates basically instantly. Once you've gotten the arrangement down, the song form, added or modified a tag ending, whatever it is you want to do to the song then go back to your RT style. Or...

2. Use the right tool for the job which is Real Band. Why do you think RB is included in the first place? This is one of the exact reasons RB was created to be able to regen parts of a song, parts of a single track, use multiple tracks to create comps of the same part using different versions of the same instrument or using a different style per track if you want.

It's the same reason a carpenter has a Skill saw, a table saw, a reciprocating saw and who knows what other saws. Different tools for different jobs. There is no one "universal tool" that does it all in music production or anything else. RB does everything you've asked about plus gives you 48 tracks to experiment with. That should be enough.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.