Until someone else chimes in...
What used to be the Triangle Fdn is now Equality Michigan. They do both advocacy as well as referrals for a number of issues. If you don't see something relevant on their resources page, give them a call.
https://equalitymi.org/
Good luck!
Edited to add:
Here are two forms that come up on a number of lists - if they're not a fit perhaps they can suggest others in/near Ann Arbor.
https://bassettmurray.com/lgbtq-law/
https://iglesiamartell.com/lgbt-issues/
I'm not familiar with them beyond their areas of practice and the general vibe, and the places they show up.
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