This is a much needed effort to show how the rights and histories of gender and sexual minorities are intertwined but I think you might be overstating the case for how many LGBs have joined the "gender critical" crowd. You write "several organizations" but only mention one (the UK's LGB Alliance) and many LGBs in the UK are highly critical of this organization's viewpoint (that the Ts are a threat to the accomplishments of the LGBs). Are there any such divisions with LGBTQIA+ organizations in the U.S.?
Also, I think we need to find a better argument for opposing trans-exlusionary efforts that "because you could be next." This seems to undercut your claim that what the LGBs and the Ts have in common is a shared experience of mistreatment due to our gender diversity (which I wholeheartedly agree with!) LGB people shouldn't just oppose efforts to marginalize trans people because "they might come for us next." We should do it to out of a sense of decency, humanity, and compassion. But also because efforts to marginalize trans people are also efforts to marginalize gender diverse people, and that includes *A LOT* of LGBs. They're not coming for us "next." They're coming for us right now!