Are the adapters from dual row header to card edge wtill available? (They were used to connect a 3.5" drive to a 5.25" drive cable) Could you put two of those back to back connected by a header?
In the late 1970's in the TRS80 world, there were MALE 34 pin card edge ribbon cable connectors! with gold plated fingers! (used on a short extension for drives in enclosures, and to convert expansion interface connections to gold-plated to withstand corrosion and lots of connections)
