I think the go is probably Allan and Tupou for the first test, but I won't be amazed if they go with Nonggorr on the bench instead, particularly if they want to give Tupou a kick up the arse or they have been working him harder to improve that fitness.
Injury permitting I expect it'll be Ala'alatoa and Tupou by the rugby championship though, so they may just try and get Tupou up to speed on the field and rely on the fact that the Welsh aren't exactly playing expansive rugby that will stretch his fitness. Might depend a bit on how Schmidt wants to play and how much he needs out of his props around the ground.