How to create key switches that trigger different chords

Could someone tell me whether this is possible to do in Logic Pro:

I want to define 24 possible chords, in 3 banks of 8, as offsets from the note played. For example, one chord might be defined as (-5,0,+6) which would play the chord (G3, C4, F#4) if it got the note C4 as input. I would like to use the bottom 3 notes of my keyboard to control which bank of chords, and the next 8 notes to control which chord from that bank. For example if the above chord was the 5th one in the 2nd bank, I'd like it to be operational after pressing my lowest C# (C: bank 1, C#: bank 2, D: bank 3) and G in the bottom octave (Eb: chord 1, E: chord 2, F: chord 3 etc.).

As this is for compositional purposes I don't even need a sequencer/host--I just want to be able to play in real-time to test chord sequences out (I'm using some microtonal tuning systems). The thing is, I definitely can't see a way to accomplish it using any of my virtual instruments in stand-alone mode, so maybe there's a way to do it through Logic.

Thanks for any hints.