IIRC, less than half of physicists believe in the Copenhagen interpretation, and more than half of the rest believe in MWI. At any rate, actual physicists who ascribe to MWI are not rare, and if your conjecture had anything going for it, I'm sure one of them would have thought of it. I'm under the impression that we have good theoretical reasons to believe that such interactions cannot happen. Making up statements that sound plausible given a few other assertions you've heard, without first understanding the technical details behind those assertions, is a poor way to generate hypotheses.