I e-mailed them and there response was "We do not have any TV tuners that will work in North America"

European TV uses different frequencies and even broadcast formats so their response is logical.

There is a guy who is doing just what you are talking about on a North American 3G MMI w/ HDD. I don't see a succesful completion post yet but I would assume that he did get it completed and that's why he didn't go back on the forum to ask for more help. I would post or PM asking him if he finished it.
http://audiforum.us/mmi/16365-splici...need-help.html
http://www.youtube.com/watch?v=9Frbbz2xWhA