Has anyone actually booked a ONE ex UK with a non UK credit card or a bank transfer? What is the ONE airlines that will accept it? What is the trick to this?

AA is telling me now that the fare is only for UK residents? I have read others on the forum booking through MRU and seem to be working, why not from UK?

Should i make a new booking through a different airline such as BA, QF, CX? As of now i have it through AA.

Trying to avoid a TA if i can to save about 400+ USD with there 75GBP fee each and credit card fees.

Thank You