Mateo in at Centre, Langi Out
Thorman in at Five-Eighth/Half, Wagon to Lock or maybe Centre, with Widders to the Bench (specialist bench players are ineffective when in a starting team. Smith is a specialist at giving specialist bench players a full game!!).
I would also get Graham and Muckert into the team when they are fully fit, but at this stage that is probably another game away (should see both of them in after the Bye). For these two I would drop McKinnon and Petersen. Burt or Graham to play either Full-back or Wing (in either order, I am not fussed). Wagon to Centre, Hindmarsh to Lock (so he could rove around the field and not get marked up by the defence - but he has been roving this year anyway, so wouldnt be a big different to him) and then Muckert at Left side Second Row. This would be my team;
1. Graham or Burt
2. Burt or Graham
3. Wagon
4. Mateo
5. Grothe
6. Thorman
7. Dykes
13. Hindmarsh
12. Cayless
11. Muckert
10. Peek
9. Morris
8. Stapleton
14. Witt or Muspratt
15. Widders
16. Vella
17. Moi Moi, Tsoulos, Kaufusi
Cannings on the bench for one of the Front-Row interchanges when he is back to full fitness.
There might be some other impact forwards in PL that I have not seen that could be worth a go, but I have not seen them so I dont think it is right to comment.