You realize that many of the guitar patterns already IN the Yamaha arrangers were made from MIDI guitar players, playing into a sequencer?

To be honest, if you are dissatisfied with the patterns that are already in it, deriving MIDI patterns from audio guitar loops is not likely to sound any better, actually, probably worse, because Yamaha have got a LOT of performance nuances added to those patterns via their Mega Voice information (rakes, chokes, pick noises, scrapes, etc.)...

You are STILL using the same guitar sounds that Yamaha use for their styles.

Basically, you want audio loop quality guitars in a style, your only option is an Audya or MS or Wersi, that can actually DO audio files. Yamaha have got about as close as can be got, with their technology and voices. Deriving MIDI information from audio loops isn't really going to make them any better...

OTOH, if you have a Tyros, you could try using a slicer program to slice the audio loops you have, and create a MIDI file to play back the loops (if you want to go at any other tempo than the loop already is), but you'll not get chord transposition, etc.. Might work with an SMF if you play in the key of the loops or use a transposer software to shift them.

But, essentially what you want to do is simply not going to be better than what you already have, I'm afraid.