# “Riffle” two strings

I have two strings, e.g., s1="A|P|Q|Z" and s2="r|ss|t|yy", where "|" is meant to be a separator. I would like to get the result as another string s=Ar|Pss|Qt|Zyy by joining the corresponding parts of the two strings s1 and s2 as indicated by the separators. What would be a simple way to do this?

StringSplit[{s1, s2}, "|"] // Transpose // StringRiffle[#, "|", ""] &