the only thing I'm not sure off is the NTSC format but it shouldn't be an issue in theory... usually that depends on DVD drive for physical games.... but not for digital when I was in the US I had a EU XBL account also and it was working on my US console even thugh EU is in PAL region....
to simplify when you have an account in a region XBL shows the features ad store of that region but to use them and buy on it you have to physically be n tat region or have your IP coming from that region... and pay with something from that region too....
but come to think of it... it is easy to check that out he doesn't need a gold account to purchase on XBL, he should just create an account from his current location and see if he can purchase from it and if it works....
and if doesn't want to bother with geeking out a router to have a VPN service redirection he should be able to do that quiet easily from a PC just using a free VPN service to buy from the xbox.com location he wants and add it to his queue from the PC.... then his console doesn't need to have it's IP in the region... when I'm at my parents house and I have my XB and there is a good deal that's what I do and even if my console IP is in EU it starts downloading once I bought it from the US store on my PC....
