I am a professional musician & audio engineer, have been playing for 20+ yrs and have played on dozens of recordings done in Canada, Nashville, Memphis and Chicago. I can add some acoustic guitar to your original or cover song.
Basic gig is for one verse & chorus, if you've recorded to a click track you should be able to copy and paste at will. If you've got other parts e.g. bridge or middle 8, variations etc. just purchase one more gig from me to cover that.
I would ask that you credit me in the liner notes/online and let me know about it if the project is for sale or is for an ad, jingle etc., just so I can add it to my resume.