The only Official ways to donate are through WU and Mail. There's nothing else you can do to make it easier, etc.
However, the Global moderators FireZ is opening a PayPal donation service in about a week. You can send him PayPal and he'll get you your donation status. You can find his service here.
I don't know if that 60 day rule is true as when I donated through Spyike I had my account for just about a month and he said it didn't matter.

