There is a high dollar conversion kit out there. I know some guys have adapted 55-57 Chevy rear brakes to the 26-27 T drums. Post the question on the Forum the Model T Ford Club International has. Lots of good info on stock T's over there.
Someone on here was posting some information about a new adapter kit to put brakes on stock T and A spindles rather than have to upgrade to the later model 37-41 spindles. Also, within the last week or so, someone was advertising about a company that you can send them your spindles or axle, and they'll custom design a brake kit for it. I just remember seeing them posted, but don't remember who it was that posted them. If you're lucky, someone else will jump in here and list it for you.