I think those are great ideas, and I do know someone, but I don't think it is someone Stephen will listen to in the end, by you posting the idea here, that person will read it. We wil see what he says.
Unfortunately, I don't live far from Stepgen but I also don't live close enough to him either to know anyone he would know. I have done much research on him and his ministry (following the steps) but I haven't landed anyone, I think would be an ally.
I also don't go to a church so I wouldn't know any religious leaders who also know Stephen.
I could look for gay affirming churches in that area where he lives and ask for their support? I will look at that. The catch is Stephen won't return any of the emails or letters I have sent. I believe he would he would If he had reason, I believe the petition with enough signatures could be that reason.