For me I delete the keyboard/guitar tack if I want to do something fancy like Allan Holdsworth type chord (often are modal and hard to name exactly but will have Dorian or Lydian feel)or quartal harmony or something with a specific voicing

I studied chords a lot so, for now I use Korg Karma do generate some arpeggios off my chords and paste the stock chords into to solo part of biab if in need a reference to play.
I still use biab printer, but I prefer a regular MIDI seq for tweaking.

And yes I agree it became buggy after real tracks.

The type of chords I mentioned are documented in the book Creative Chordal Harmony by Mick Goodrick and Tim Miller or Allan Holdsworth Searching for the Uncommon Chord.

Even if you want to do a Pat Metheny song your better deleting piano parts and using the exact parts in his book