Not exactly what you’re talking about, but have you tried Anaphora yet? It does record while reversing, and the reverse and record buttons are included in the pattern recorder, so that makes for a fun time.
It is better for atemporal stuff. But I got some loops to sync up pretty good to tempo, then I’d print them and drag em into re:mix.
With two grids, you can run both apps at the same time and set up track routing to go from anaphora to re:mix. Might be able to do everything live that way.