chuckebaby
bapu
chuckebaby
1- Record a midi click track to the song by hand using a keyboard
(you can do it by drawing midi notes in the PRV but it takes a year and a half.)
You're my new hero.
It took me six years.
my mind is blown that my suggestion has been over looked 
All he had to do was tap a click track to the guitar part.
choose the click track and select "Fit to improvisation"
no midi bounce down, no audio stretching. The timeline would have followed the guitar track.
the midi would have followed the project tempo automatically.
You need to be careful with Fit Improv when there's audio in the project. Any clips that don't start at 1:01:000 need to have their Timebase changed to Absolute in Clip Properties before executing Fit Improv.
Incidentally. I always think the record-a-MIDI-click-track approach is inherently problematic. If the existing tracks aren't already tight as a drum, it's not likely the click track will be much better. It might let you get the timeline roughly aligned to the original MIDI/Audio if it's way off as in the OP's case, but it probably won't be an ideal quantizing reference because the click is going to drag when the performance is rushing, and vice versa.