In my opinion, having to “decode” a crucial piece of info via another site is a no-go. I can see absolutely no benefit in this - for either party, because the host also has to look up those codes when writing his profile. Also, room for error - you mean rule “ab”, but accidentally put “ac” in… No.
I also honestly can’t see how stating house rules could be embarrassing. Or scare people away who wouldn’t also be scared away by having to do a puzzle first and then getting the rules anyway…