I think I might have an idea. I copied the one, lone second synth track over to variant B. Now instead of muting the first synth track, I switch over to B, trigger A for the next bar, rip the LPF wide open, set ride cymbal volume to 0 and hit mute-clear. The switchback to A at the end of the bar drops everything in perfectly on beat.

Now I "just" have to train on how to quickly finish all the manual steps on time within, let's see... 4 beats at 135 BPM... ... 1.7 seconds. 😅😭