The ideal person you'd want to finally interfere at the end of the match is none other than Goldust; but since Dustin is with AEW, that's a no go. However, I wouldn't choose Austin either because it doesn't make much sense and he, like Triple H, can't go anymore either. You could say Cena, but he also can't go, neither can Batista probably, and then you have your usual suspects in Seth, Orton, and Knight, and even Styles, but that's all so cliched at this point.
You could make a case for Brock, but he's supposedly on cool down, so you're really running low on people.
NOW... if WWF were able to sign Okada, then there's a way to introduce not only a hot new star, but give him a memorable moment; the once rival turned friend of Cody helps in beating the head of the table. Cody and Okada get to have a friendly feud and then Roman/Solo/Rock get to feud about how they all are stupid.