Which is the best pairing then?
Rice-Gallagher
Rice-Wharton
Rice-Mainoo
Rice-Trent
Other?
For me Wharton is the best fit. Try him in a group match and if he fails, it probably won't be fatal to England's chances overall.
If it clicks, he could be a key player for us, like Kalvin Phillips was in the last Euros, also coming in without a lot of caps.
In terms of balance Wharton and either Rice or Gallagher. If we want to play Trent needs to be in a 3 man midfield.