This may be a little late, but similar to VaughnT's idea, these might work:
http://www.boltdepot.com/Sex_bolts_and_Mating_screws.aspx
http://www.ebay.com/itm/Norton-Door-Closer-Sex-Bolt-Kit-Oil-Rubbed-Bronze-/320784350556
They too would require some hammer work to make them look handmade, but you would avoid the offset heads.
Oleslow