I'd like to do the same... I've got a 510 and the 811 on the same TV. When I asked the CSR she said I couldn't for some reason I can't remember... Maybe someone else has more info?
Get a good universal remote. I highly recommend the Home Theater Master remotes. They are well made and are very versatile. If you don't want to spend the $ look at the One For All or Radio Shack line.