What a PITA! Took me ~6 hours to complete.

A lot of that time was trying different methods. I tried variations of the spiffyshoes solderless PS2 hack, but that turned out to not work very well. In the end, I used Ben Heck's method of removing the connector pins, and the connector itself, and soldering to the little pads left. I ended up having to use a very small guage stranded wire and zen-like concentration.
After all that, it works perfectly. Not sure if I'm going to offer these in my hacking service thread. I should be able to do them faster than 6 hours next time, but it'll still be pretty time-consuming. If I do offer them, I'd probably have to adjust my pricing to reflect the amount of time involved.