This is an issue I have been uncomfortably aware for a while. I have never before seen anyone comment on it.
Let me suggest that your awareness of it makes you someone I would prefer to have around in a women's group.
I say this as someone who has been burned on this very issue, repeatedly so. But I would prefer to seek a path forward for both cishet women and trans women, one that victimizes neither. That path won't be found without people like you.
If Leap is something you feel would benefit you, I hope you will reconsider your position and join it. If it doesn't work out to your satisfaction for any reason, you can always stop participating.