This is a good idea. Maybe something like C/C/D where the first slash is the bass and the second the high would work
Which, when you think about it, would give you complete voicing for triads, and so would be a big step in the direction of being able to simply spell the exact chords you want. "I'll have the C4/E4/G4, please, with a D5 on top." Presumably there would have to be a filter so you don't get to tell a guitar to play C4/C#4/D4/D#4 (Mario, if you can find a way to play that chord, it should be named after you!)