I'm sure they should be able to sign them now they've announced there's 'no conflict' between women's rights and the rights of people who aren't women but have cooler, more signable pledges
Of course there is a conflict when someone attempts to occupy your space and claim it as their own.....It is called colonisation.
The idea that trans people don't have the same civil rights as everyone else is a nonsense........what is being sought is additional rights to everyone else. the right to self declare one's legal identity and have the world conform.
Take that to its natural conclusion then equal rights would mean we could all identify as whatever we liked and it would be validated and protected by law.