@Ellie ******
Again, my plan is to transfer the new 1 year Non O retirement visa, which I will get in my current passport that is almost full. And if I can also transfer the multiple entry stamp I was planning on getting with it, then I will also obtain that stamp, in my old passport.
Then I would have plenty of time here in Thailand (1 year) to get a new passport, and then transfer both the visa and the multi entry stamp over to the new passport.