Somebody wasn't paying attention during the Olympics womens' boxing competition, when all the permutations and combinations of XX and XY were discussed at length - and I mean at length, I think there were several threads running at once!
'XX' is representative to all intents and purposes, and already accepted as a symbol of support for biological women - a number of women at the Olympics displayed an XX sign by crossing their index fingers over their heads, and its meaning was clearly understood.
The word 'intersex' is so out of date and rejected by people with DSDs that I think it's a kind of shibboleth (in the sense of a distinguishing word or phrase) in discussions about the rights of biological women.