I’m slightly embarrassed that my first post here (hi, longtime lurker) is self-promotion. Alas. I did a short album of noise/drone tracks done with a Bugbrand Audioweevil a few years ago ( https://sighup.bandcamp.com/album/held-in-frame ). The limitation was fun to work with (come up with a cohesive set of tracks using just this little drone box, that emphasizes/relies on its character), but I cheated a bit in that I used a pitchshifter effects pedal for note changes, and a second sound source (a trogotronic 666) for some clicks on the final track. My goal was really to perform each track in a single take rather than track/edit, so I chose to avoid being too religious in my observance of the limitation. And by the time I’d recorded a dozen or so tracks with just the Audioweevil, I found I was getting restless to allow for some flexibility.
Keith Fullerton Whitman’s synth releases might be a good place to look, although I’m not sure if a eurorack system counts as a single piece of a gear, more like a well-curated set of many. His Generator/Generators/Live Generators/Occlusions records I think are all single-take performances on nothing but his eurorack system.