Language can change and does all the time; changing the spelling seems...just silly to me. If the point is that women need a different label why not a completely different word?
I've seen 'non-men' recently used to describe women. Super progressive.
Sorry. As a feminist, I am keeping woman - an adult member of the ova producing class. Of the class who can gestate, birth and breastfeed her young.
Every actual feminist I know is currently fighting to keep her right to 'woman', forget fancy spellings...