One of the options after converting it to digital,is uploading a torrent or a file sharing site..
(Same system people use to grab movies from pirate bay and the like)
You could name the torrent anything, so even if people searched for it they would not be able to find it.
Then after a donation/payment, the interested part would be given a link to download said torrent.
This would however rely on the honor system as there is nothing stopping people sharing the torrents location, but on this site i think you would be ok.
Another advantage is you will eliminate the burning/shipping/region issued with the film, effectively taking the hassel from the operation.
On another note, the film may well be brittle, i took some old reels of my parents wedding , ran em through a projector i picked up at a flea market, hoping to film em via a digital cam, but it was so old it broke every few frames, so proffesionally might be the best way to go.