You can change the boards to 2x7 and use IDCs with each 2 wires in parallel.
You can change to 2x4 and use normal IDC, with 1 pin for key.
1-row IDC connectors exist but I don't know where to get them. They go with
flatcable that has the wires spaced out to 2.54mm. Some are used in consumer AV
equipment. Someone wanted to know what a (pictured) Stucko connector was this
week, you might want to check that avenue, as there are many connectors like
that with IDC male and female on cable, and many are SIL, even with 7 pins in a
row. IDC cables take a few seconds to assemble each. A low volume assembler will
likely oblige. But do not skip the final test on the cables, the initial failure
rate on IDC cables is relatively high.

hope this is useful,
Peter P.








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