Honestly the perks aren't even that great, unless you want to enter the park 15 minutes earlier or get a package, it's better to stay at a hotel on the resort line.
https://tdrexplorer.com/tokyo-disney-resort-vacation-packages-return/
He has plenty of information about the resort, TDR explorer by far probably has the best idea about hotels.
If you are trying to book a package, I have no idea if foreign credit cards will work on the site. TDR has a notorious site that does not allow foreign cards to buy packages or tickets.