Sure. I don’t want to go off on too much of a tangent, but what I do is pretty simple (and I plan to try it with QPAS )
Most of the time I just take my mid and side signals from the modular, assign them as a stereo pair to a channel in the DAW, and put the free MSLR plugin first in the chain. I often have to adjust relative levels of the two inputs to get it balanced, and will add GMonoBass afterward if it seems necessary. (I don’t master for vinyl or mono, but I always want my bass to feel relatively central and narrow in the stereo field anyway.)
If I want to individually process mid or side signals within the DAW, I’ll assign them as mono inputs to separate channels, apply whatever effects I wanted, pan and mix them into a group channel, and put MSLR on the group.
(I use Maschine, which seems wildly inappropriate for the kind of music I make, but I’m used to it and can fly around in it easily. It’s pretty flexible about its audio routing.)