I think that if you want to hear a discussion about a political or ideological issue on your radio/tv show that you should only include people who are going to turn up.
If Bex Stinson is not willing to discuss with even a moderate on this issue (which Helen Lewis is) then Bex Stinson shouldn't be involved. Stonewall either has to bear the questions and consequences of their actions or they get left out of the conversation, tough shit.
Why not ask Jane Fae and actually bring up the topic of Fae's support for extreme porn and their misogynist and dismissive view of women ("eggshell skulls").
Or ask Shon Fae and bring up "enjoy your erasure" and their words to young people encouraging early sexual activity.
Ask Sarah Brown and bring up "suck my balls", their manipulation of Cambridge Council into breaking equality law and disenfranchising women, as well as their gross behaviour towards Julie Bindel.
Fgs ask Susie Green and actually bring up, well everything she has done, from taking a child to Thailand at 15 for elective genital surgery illegal in this country and then laughing about it on tv, to encouraging parents into unethical treatment by a doctor reprimanded for running an illegal practice, to her organisation being barred from further contact with a child after they colluded with a parent in the forced transitioning of that child.
Ask Lily Madigan and... well let Madigan speak for themselves, that's all the exposure they need really to show how utterly fucked up their behavior and views are.