gaw- We shouldnt turn away someone that wants to know more about yiddishkeit regardless of whom they are married to. We teach them more about torah and yiddishkeit and tell them that we dont allow marrying a non jew. We do not say “first let me see divorce papers and then we can talk”.(The same for the guy in your shul who speaks Loshon Horah all day long that we dont throw him out of shul until he swears to never say l”h again)
With a Ger its a different story. Either he accepts ALL 613 or no geirus.