I've been looking and can't find discussion on which airlines will ticket what. Can anyone give me any pointers for where to look?

My situation: I have an AA issued DONE4 which I want to reticket with none of my intercontinental flights on AA metal (my preferred route has HEL-LHR-JFK on AY/BA which I want AY marketed, and JAL metal for the flight out to asia). Only long haul AA flight is JFK-LAX. Will the AA rtw desk be happy to (re)ticket that? Anyone have any experience or pointers on getting AY or JAL to ticket?