I have it all working!
The mating part is a 3M 05111173839, although there are other parts in the family that will mate to it. The pinout is:
1:5V 2:Gnd
3:5V 4:In5
5:In4 6:Gnd
7:Gnd 8:In6
9:In3 10:Gnd
11:Gnd 12:In7
13:In2 14:Gnd
15:Gnd 16:In8
17:In1 18:5V
19:Gnd 20:5V
The inputs are 5V logic only at a fairly low impedance, so you will need some sort of buffer. I built a board with a 3V and 1.8V regulator, along with a pair of `07 buffers. The board is designed to fit into a little tea tin, sort of like an Altoid's box, with a switch to go from 1.8V - 3V, and a connector that fits the Logic Saleae probe set because those are cheap and easy to get. Plus, I have spares.
If anyone is interested I can post a schematic and I have spare parts as well.