Another idea for you if you want to go the AONE5/6 route is to work out a really really long one and straddle it over 2 qualifying years, if you do it from a cheap(er) origin like JNB or MRU you add the positioning flights or another nested A/DONEx. The idea being to lower the cost per EXP qualification.

Just break off at 66667 and pick it up again next year and the remainder goes on next year's tab. Just have to start in March or something so the 'next' year's can be done in January and stay in the 1 year validity of the ticket.

Warning: you can waste hours and hours of your life playing with the routes. I know I have enjoyed wasting those hours immensely. Now I just gotta get off my rear and take the trip! Kathmandu hmm