If the only people who wore “protect trans kids” buttons and t shirts were trans kids, I guarantee there wouldn’t be much of a market for them. And yet we see them.
Wear a damned t shirt. Put on a pin. Put a flag in your profile. I want to see people put even one tenth of their necks out that I do every damned day.
And, yes, don’t stop with that. Put the meaning behind your pin, and actually make a safe place for me. You’re afraid of rainbow washing and meaningless symbolic gestures? We’ll make them have some meaning. But if you don’t have the guts to give me a sign so simple as a pin, what does that say for anything else?