If it's JUCE it should have a VST version, did you ask them about that ?
I see it has an audio stream vst but I suppose that would be much the same as ReaStream free vst.
You should be able to drop Yamaha style sections in a Biab track and snap them to chord or key with the reajs.dll vst.
That is a drawback with Biab, it's a pain in the *^(^ to drop n drag midi in.