I don’t know if you’re still shopping this but I learned a trick on the keystep pro where if you hold down the track button for tracks 1-4 you can do an on the fly quick change between global midi channels for that track to be assigned to.
Still an expensive option, but it has the potential to do what you want to do on a per track basis instead of what I had believed prior, which was that it would be necessary to change based on multiple track assignments.
It does still require that you turn and then depress the encoder while holding down the track button so both hands required, the only 1 handed change I can think of would still be to preset different tracks with different channels.
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