Continued on from my previous question, I ultimately deleted my 3DS NNID and decided to recreate it under a different region [which will have to wait until my birthday due to parental problems]. The thing is...which eShop regions can be funded with foreign credit/debit cards?? I'd like to get a full list of the region-free eShop countries before recreating my NNID, because once I set my mind on the country, I can't change it without deletion or reformatting [which is the reason my old NNID got deleted].
P.S. I'm mainly doing all of this to get 3 eShop-exclusive titles that I especially want. They cost about 31.97 USD in total.
If it's just about the payment methods you can safely use any non-American region. For example European regions will accept your card. Only North American regions restrict their access there. The U.S. region also requires an address in the U.S., while other NA regions "only" require the credit card to be from an American country.