Before the paper FP machines were taken out, Swan and Dolphin guests were able to make same day FP+ reservations in the park, at least at Epcot. They were the test for the same day FP+ system that is now available to all offsite guests.
To me, that is a clue that S/D guests may be the first to test advanced FP+ reservations for guests at non Disney owned resorts. I wouldn't be surprised if that happens in the next few months, but we will see. I wouldn't expect it in time for the OP's trip in 10 weeks.