For the quantizer, the Arpitecht might tick some of your boxes:
https://modulargrid.net/e/wmd-arpitecht
And I agree with @HGSynth that a Grids and/or other logic based trigger sequencers with switched mults or mutes for routing can greatly expand improv drum sequencing. Pair that with something like the vpme.de Quad Drum or the Prok drum modules and you're performance ready (after some practice of course)