Yes you can use them in RapidComposer it can "Render Phrase with variations".

You don't need to play guitar to use Guitar Pro it has music notation and Tab, I would try TuxGuitar first it will save the pitch bends to the midi file export but GP6 won't.

Presonus Progression 3 has Rewire and I think it is cheap on special, but has no Midi out and won't save the pitch bends to midi, but it's worth looking at https://www.presonus.com/products/progression

Yes I got a good deal upgrading to the full RC,

RapidComposer Automatic Virtual Instrument Phrases Articulations

Importing UserTrack Templates or Biab Chords to RapidComposer

RapidComposer Export Chord Sheet to Biab RealBand Cubase