My first line pick is Paia'aua 12 and Kerevi 13, but it really depends what type of game they want to play outside Quade.
Paia'aua is very much a second playmaker and his running is more slippery than confrontational, he evades tackles rather than busts them. I think with Quade's ability to place a pass, and Kerevi outside drawing defenders, Paia'aua will find plenty of space to break the line.
I'd also be happy with Kerevi at 12 and Magnay or Perese at 13 which reverses the effect with the crash runner creating space outside him, but I think you get more options with two playmakers.
Another interesting question will be what they do if Quade gets injured, as he tends to do. Whether they go back to McIntyre or put Paia'aua to 10. Personally I'd opt for the latter, they both still have a fair way to go to be up to the standard of playing 10 at this level, but Paia'aua at least brings a genuine running game.