(It sounds as if you think that this ought to mean that you'd have conscious memories in one branch from other branches, but I can't see why. Am I missing something?)

I misunderstood what David Gerard was suggesting and took a long riff proposing an experiment to address something he wasn't saying.

The tricky part for me is the extremely clear conscious experience I have of being on only one branch. That there are other consciousnesses NEARLY identical to mine on other nearby Everett branches, presumably having the same strong awareness that they are on only one Everett branch and have no direct evidence of any other branch is clearer to me. MWI seems to truly be an interpretation, not a theory, with apparently absolutely no Popperian experiments that could ever distinguish it from wave function collapse theories.