I reckon there are fewer genuine contenders now than there were a year or two back, so its a more nuanced selection. Nailed on certs? Well, I doubt anyone would argue against Williamson, Kohli, Stokes and Cummins, and there wouldn't be many opposing Watling right now. Smith is also a near cert if you are prepared to overlook the cheating, shameless sooking and general disregard for the spirit of the game. Meanwhile, there is no stand out spinner, nor are there any really strong contenders for the openers berths - indeed, I debated starting my line up with two of Pujara, Williamson and Labuschange on the basis that the OP's allowed one place either way. That would allow:
Pujara
Williamson
Kohli
Smith (or Labuschagne)
Root
Stokes
Watling
Cummins
Rabada
Harmer
Boult/Bumrah
But eventually, my selection (with Smith omitted on moral grounds - or lack of morals grounds):
Edgar
Pujara
Williamson*
Kohli
Root
Stokes
Watling
Cummins
Rabada
Harmer
Boult or Bumrah