A couple of fairly stupid 'non academic' ideas strike me here, but they might be phood for thought... but whatever you do try to ensure his work gets preserved somehow.
...he is suspicious of publishers, believing that they are out to make a lot of money off authors ..
Perhaps something like the Mudcat could be used to market the tunes in exchange for a suitable and acceptable donation/cut to all concerned?
... he wants to publish the sheet music handwritten... Your very own unique tune for only $10 or $15 framed with accompanying certificate saying only you may play it royalty free? (others have to buy a whole typeset book and pay per play .. at least in theory)
eccentrically yours ..wes