I have donated to "Get the L Out" as a "straight ally"
www.gettheloutuk.com/
I do find the "trans ally" thing creepy but that's because of how they do the "ally" thing. Also the suspect characters in the Mumsnet "Allies and Boundaries" thread about some TW who purport to be allies to women.
I want to support lesbians as in wanting to support a just feminist cause, not because I have some psychological need for approval by lesbians or because I want to "earn" the right to be accepted into "lesbian spaces" or gaslight lesbians into feeling they are indebted to me.
If I was told, "You mean well but that's actually not really helping, this would be a better way to help instead" then I'd take notice. However, I can't imagine lesbians pulling that TRA-type emotional blackmail shit, "If you were a true ally you'd . . ." (usually a demand for money or goods or to STFU) but if they did I'd tell them to F*ck Off!
Maybe it will vary from place to place whether lesbians want support at Pride events? Pride can't legitimately object, seeing as they are happy to welcome anyone who supports trans people, although I don't suppose that will stop them having a go. There are lesbians involved with Resisters groups so word will get out that way too about what sort of support would help in different places.
I am f@ckin FURIOUS about what is being done to lesbians BTW!! 