You can do this with your NA also, but this will save you the markup on UK PSN Cards.
Log onto your EU account at SEN. Minimum funding amount is 5 pounds, which is $7.82 US.
Unfortunately this is not available for HK or JP....
Wasn't paypal available for EU early this year? I also think I read somewhere you need a EU address confirmed paypal account to get funds through during that time.
Did it changed? Anyone tried funding it?