You can setup Blizzard on your own TOTP app instead of theirs.
Technology
Ice Cream Sandwich (ICS) for Australian Motorola Xooms
If you buy a Motorola Xoom in Australia, you will struggle to update it to ICS without some reasonably technical changes to the tablet. I bought a 32GB wifi Xoom on special from Costco in Canberra (AU$359 with free gel case) after reading up about it and doing thorough research, or so I thought.