Eh - I thought dash was a pretty reasonable symbol for “There’s a contraction here” I don’t really care about the actual symbol as long as we stop using the same symbol for contractions and possessives. In my sample It-s would currently be written It's and the it's (a possessive) would be its if that’s what you’re asking.

Possessives always get an apostrophe outside of weird exceptions where they clash with contractions. I’m proposing we fix that. Also - let’s bring back mass possessions like “At the bake sale Moms’ baked goods are always delicious”