What about to deposit money with VISA/Mastercard on WebMoney and then donate with WebMoney?
You can't deposit money using credit card on your WebMoney. But You can buy WM card to do soo , using you visa
You can donate using this option. Im from Poland and I tried today. Donated 10 RUR on 15x
WebMoney option is good , not so expensive ,but entire instalation/registration process is a bit long and complicated