I tried this and wasn’t thrilled with with the results from grids. Also had a pam’s in there for modulation, and spent a few months pretty diligently trying to configure modulation. There were some really fun jams, but it didn’t do the trick to consistently. Two main issues were: can’t do effects on the drums individually (thinking in terms of ‘dynamics’ more than outright sound-design) and Grids clock doesn’t respond well to a swinging clock (which I’m always using for the main parts of my patch), so Grids also had to function as my leading clock, which also meant I couldn’t control swing fidelity dynamically (swinging 32nd notes vs 16ths vs triplets or w/e). I’d really recommend Marbles over Grids, even if you’re not looking to use the pitch outs (I never do), since you can set it, let it unfold, and then loop it as the last step before recording when it comes around to something you love.
Here is a link to the patterns contained within Marbles red mode – you can use it as a key for drum patterns and just do the interpolation of the parts yourself for each patch (which will take two minutes) and use any three channel gate sequencer (or a two channel gate sequencer and your leading clock) to control the drums. It doesn’t sound like you really want the grids insanity, and you’re already sequencing by hand, and getting / racking marbles to use one side isn’t really all that cost / space efficient. Even if you’re buying a compact sequencer to make it work, you’re gonna save some space and some money doing it this way.
Final option would be triggering drums by hand through a cheap delay, so you tap them in once and they just loop forever (with a VCA or FX after the fact for more control), which is an angle adjacent to what I’m working on (just this morning!) and seems the most intuitive / playable route. Plus refining one’s sense of timing is never a bad idea. And to start off
you just have to be able to play a kick and a snare roughly equidistant from one another. Going to be using the Marbles contents as a starting point for patterns to practice on my trigger pad…
edit: added the actual link instead of just saying HERE IT IS with nothing attached