Guess you could replace the toggle switch with one of these😆:
https://www.carbuilder.com/uk/long-stalk-momentary-toggle-switch?gclid=EAIaIQobChMIn-C-wKiv9wIVlu3tCh1bsARoEAQYAiABEgIkJ_D_BwE
Is your gripe the cost or the number of pieces of equipment? An upgraded version that doesn’t require additional hardware would still cost as much as a C4 plus small controller.
No reason why you shouldn’t be able to do this, though the upper two notes will have to be synth notes as opposed to pitch-shifted copies of the original signal.
You can navigate to the preset you want in the app (so can see its name) before you start editing (under burn or browse (can’t remember off the top of my head).