Different sounds on same key

You can work without the GUI, be it with less freedom.
If you adapt the CCmap.csv manually covering useful presets and assign CC's to choosing the defined notemaps.
Similar with voices, which can have their own set of notemaps.
Yes, all this is clumsy / not flexible enough for you purpose, but I'm afraid that's all within current possibilities.
As stated above: food for thought - I consider this a valid/interesting question.
Regards, Hans

Great Hans! Glad to hear about the 'food for thought'

Best
Sur