Like Chaos said, TPoC have different needs than white trans* people when it comes to support. Dealing with racial stereotypes coupled with religiosity or the tendency to be more family-oriented are very real hurdles. I hate to say it, but I know for me, it would be harder to just walk away from my family if things went sour than it seems like it would be for the average white person.
While I'm white-skinned, as a Latin@ I wouldn't feel comfortable in an all-white group in the same way I wouldn't feel comfortable (and definitely not relevant) in a group for teens. I just have different concerns at this point in my life than a junior in HS might.
Perhaps try doing a one-off event with a theme or subject that is relevant. Or reach out and see if a TPoC might be interested in starting a group specifically for PoC. (And make sure there isn't already a support network in place for them that you're just currently ignorant of.)