I’ve always thought Julian Lennon sounds eerily like John. And I think Eric Clapton would be a worthy stand-in for George. So the lineup for Beatles II…
Julian
Paul
Eric
Ringo
Doesn’t quite have the ring of John-Paul-George-n-Ringo does it?
But I’ll bet they’d make a good sound.
They’d better hurry though, I sometimes wonder how much longer Paul is going to be around. Ringo? he just seems kinda ageless. He’ll probably be the last Beatle standing…
John: Neil Young (sorry for stealing, but he’s just perfect) OR Petty
George: Prince
That link is to Petty singing While My Guitar Gently Weeps (with others), and then Prince comes in and blows the roof off the place with one of the sickest solos I’ve ever seen.