What's your proposed easy way for the multitudes to make this pin connection? I can think of a few ways, but don't know if they'd be the ideal ways. ;)

Well, for my own dock I will just cut into the cables, and splice them together, disconnecting CD from the serial connector at the same time (to prevent having two line drivers fighting over the same signal).

But a less intrusive method would be to just solder a pair DB-9F / DB-9M connectors back-to-back, and do the splice/cut therein. Then just plug the finished doodad into the existing connector.

Cheers