Thanks for the suggestion. Something similar would be feasible using a few Lightpad Blocks and a little bit of programming. Another creator has made something akin to this but modeled on the cello:
See https://github.com/wangpy/LightpadCello for more details.
I'd buy a Roli MIDI guitar solution.
I'd be super happy with even a modernized MIDI strummer device, where you can press down chords on a standard MIDI keyboard or even a ROLI controller, then no notes are sounded until you run your fingers across the strummer. No such thing appears to exist in a cohesive and compact form that is ready for mass market! (I.e., Jamstik and Artiphon Instrument 1 require that touching the string plays the notes.)
Bring back the Charlie Lab Digitar for a new age!