I'm going to be honest, the longer England continue with Buttler opening, the longer they are wasting their resources.
Jonny Bairstow
Jason Roy
Dawid Malan
Eoin Morgan
Jos Buttler
That's the top five that needs to be inked in, if not etched on a stone tablet. They're all five in their best positions, all five among the best in the world at those roles.
They'll want Ben Stokes in there somewhere too, but it's worth remembering that his Twenty20 International record is pretty shite. He certainly doesn't merit a place above any of these in the order, nor does he really merit a place in the main five bowling options. That said, he's so influential that he slots in at six as a sort of contingency option.
Ben Stokes
After that, you need the five best bowling options available, ideally at least two of whom ought to be spinners. Their batting ability should be secondary at best. I'm not exactly sure who they are, so I'll edit in once I've looked at the squad but if I was guessing:
David Willey or Sam Curran
Chris Woakes or Tom Curran
Jofra Archer or Mark Wood
Matt Parkinson or Liam Dawson
Adil Rashid
The bowling options are where the real question marks are, mostly because T20 demands very different skills than other formats