I have a working but not finished tool for creating the Unison effect. Want to add a GUI so user can enter number of voices and limits and possible change it to a weighted curve (or give option between random and weighted.) Although mine works on random changes, so each time you generate a Unison it will sound remarkably different, rather than your even and calculated method of distribution. If and when I get around to updating the even spread is another possible option to add to it though.
Also thought I had made my own thread for it but could only see it there on searching…