I haven’t tried this, but on the Kijimi you can modulate wave shape morphing with LFOs, and you can sync the LFOs to incoming MIDI. As long as you were playing / sequencing at a steady rate you could sync up such that it was a different shape per step.
(Also worth noting that the wave shape morphing is smooth, so you’d get some of that transition while the envelope is open, I think unavoidably.)