My mix is a cannibalisation of two different tracks (with additions by me and tempo matched).
i used the AI vocal track and placed it where the vocal was on an instrumental of the 2nd track.
The only major edits i did were to place a Paul "oooh" near the end, the final line "God Bless...." i added to the the end because it made sense, and in the guitar solo i reversed Paul's "oooh" for 1967 effect
Listen to it a 1000 times like i have and it makes sense
illustraion below, the top track is the original vocal track, and as you can see i had to reduce the volume of the AI vocal a lot to match the backing.