Joseph
“You can check this with Rav Heinemann. “
I have! I asked him about shaking hands in general he said he was quoting his rebbe (R’ Aaron) “besser zich arois dreien fun deim” In other words it is better to avoid it but not assur. (He agreed this was his intention)
I have this all on tape
It is not out of the world to say a handshake isnt derech chibah. Obviously R’ Moshe disagrees (at least a few decades ago).