I just stumbled across the PER|FORMER in the DIY 2019 thread:
viewtopic.php?p=2998922#2998922


https://westlicht.github.io/performer/
https://www.facebook.com/pg/performerseq
You can even run a simulation of the sequencer via the website. Classy.
FWIW this is something that deserves to be discussed in the regular Eurorack section - the documentation is extensive and the project looks so well thought-out. If you can't DIY it, then ask someone here to do it.