I've been wanting to see this too; I don't know whether the Brattle is actually legally allowed to show it given the copyright issues, or whether those have simply blocked the distribution. (Apparently Hanshaw's estate, which is claimed by multiple people, insist on a licensing fee which is effectively high enough to prevent anyone from ever using the music again. Sigh.)

However, I will support whatever efforts you make on this film's behalf, and I will also come with you if you end up having to make a trip, if logistically possible.