LilP, Well you seem have your head in a good place. I am using two Arturia Beatsteps Pro which gives me 4 64 step sequences, there is a polyphonic tool from a different perspective. I'm happy to hear that you have similar thoughts on polyphony in Eurorack as I do. One incredible instrument you might like is a new module from Humble Audio

https://www.modulargrid.net/e/humble-audio-quad-operator

https://www.modulargrid.net/e/humble-audio-algo-expander-for-quad-operator

This one is impressive. Its actually 4 oscillators that can be used as separate voices which sound amazing. But this is actually a Linear Through Zero FM Complex Oscillator. There are reviews on it already

You might be interested in this one.