sorry, but I suddenly had two questions, 1. how Rewind Sans will react to the Lust version of himself (maybe you are tired of answering such questions) 2. and Reverse Sans will attack Swap! Rewind Papyrus (or catch him as a candidate for the Reverse brother's vessel )
No, Reverse wouldn't be interested in Swap!Rewind because he is a Swap. When it comes to Swaps, there is a very high risk that a Swap's soul isn't Papyrus coded, no matter that they may look like a Papyrus and are called as such; they're still a Sans in their coding. And well, if it isn't a Papyrus coded soul, it's useless for both Reverse and Rewind. No, he'd have to go after Swap!Ghost instead but as we already established before, nobody knows he still exists so that's useless too.