Only 1 team is sponsored by Nike in the entire Premier League, tells you something when all the clubs have left them, as for Adidas they have the same templates for every team
Not just in England, but off the top of my head:
Celtic (New Balance)
Juventus (Adidas)
PSV (Umbro)
Have all left as well. Now wouldn't be a bad time to go back to Nike really.
As for Adidas, they do use the same templates but their stuff is by far the best quality of any manufacturer. The bigger problem would be getting the three stripes to suit the claret and blue.
That's easy, blue sleeves with claret stripes