Octave split on a MIDI keyboard

[diminished]

Folks.
Is there an elegant way to split up your MIDI keyboard without doubling everything in a combinator?
Imagine having a 25key keyboard, but you want the lower half to play in octave C1 and the upper half in C4. All on the same instrument. Is that even possible and how would you do that?

[mjxl]

Maybe limit the main instrument to C1-B1, add a dummy for C2-C3.
Put a CVPT on both and take gate + note from dummys CVPT to main?