I thought Phil wanted to try it but Mike refused as he "can't remember" the guitar tuning for the opening section.
that's bee Mike's reason for not playing some early material since at least the Mama tour. No doubt some truth in it but I know at least two guitarists he could ask....if he wanted.
I don't think there's any evidence that they got as far as finding out if Phil could handle the whole song. Tony wanted it. Phil was up for trying. Mike was not. Mike won.
I recall in the tour doc a scene where Phil tried (but failed) to hit the high notes near the beginning of the song, in particular the section “Can she be late for her Cinema Show?” Could be Mike wasn’t up for it as well.