I feel your pain.
And no there is no such disk, although you could get a mod chip to make your wii region free but its not a good idea (it voids the warranty). I do believe that the company that make the freeloader disks are working on a wii version, but it will probably be vanquished by a wii firmware update. The best thing to do is to buy an american wii and then get the game. This probably won't be what you had in mind but it's the best solution (if you have loads of cash).
I really need to stop contradicting myself.