The only two ffp`s, where you get more than 25% when flying booking class S with BA, is Finnair Plus(50%) and QF ffp(kangaroo route). The redemption rates from Finnair Plus also, aren´t the best and the miles expired after 5 five years. I think the QF ffp would be the best, among the poor choice.
It shouldn´t be a problem to join the QF ffp outside from Australia, or NZ. When I join the ffp with a Europe address, the haven´t sent(perhaps it change) the Bronze plastic card, to the Europe address .