@WanderngAramean gave me a great tip: create a free account on Qantas.com and then search for a Oneworld reward flight all over the world. American’s website won’t show you their international partner’s reward inventory, so this appears to be the best alternative to calling them. I believe you will still need to call them to actually book with AAdvantage points, but this can speed up the search.
I am trying this out myself for a trip we hope to do to Europe this summer.
Join Qantas link: https://www.qantas.com.au/fflyer/dyns/joinff
Note: If you are a resident of Australia or New Zealand, Qantas will charge you to join their frequent flyer program, but it is free for the rest of the world. I can’t really understand their logic on that, but since it is free for over 6 billion people, I won’t complain.