Two songs that I've done by the Fabs that work pretty well are "Octopuses Garden" (finger-picked) and "All Things Must Pass" in an open-tuning, or using open chords in standard (it's been a while and I am not near enough to a guitar to find out exactly).
Two thoughts about Yoko:
I try to keep in mind that John thought very highly of her and her music and he is one of the few "genius" guys out there whose opinion I hesitate to ignore.
About her "breaking up" of the Beatles, as George said so succinctly - All Things Must Pass Away.