Anti-american stables have been done to death and rarely get anybody over in the long run. Sheamus would be taking a huge step down going into a UK (& Ireland) stable, Wade has already just led a huge invasion angle. Regal has also done this gimmick before and I find it to be the least enjoyable version of his character (including Real Man's Man
).
Let these guys build their own interesting characters instead of giving them the shitty "Foreign guy hates America" gimmick.