I think an alliance is possible but we would have to have a very very strict terms of reference, that sets out the strict membership criteria and clear objectives of said alliance. And it would have to be agreed that this cannot be altered or amended in any way.
A loose affiliation would also require topics of discussion on the periphery of the alliance as excluded from debate,
We can see from various groups and affiliations that there can be mission drift, disagreements on say how hard is the line is, on trans rights, etc. do we include surrogacy?, (no IMHO) even though i do not agree with it.
So we would also have to inspect what issues are lobbied from elsewhere, Christian right, sex matters, Genspec, and defer to them for some more detailed arguments.
I think on reflection this could prove impossible.
We might end up sounding like a scene from life of Brian.
However willing to explore.