This is the diagram I used to wire up my conversion; it's pretty easy to follow. It almost parks the wipers in their location but not quite 100%. As you said, you may have to play with that cam switch. Its important to also have the original plug that goes into the Honda wiper motor for this...so when you remove the motor from the car, chop a fair bit of the loom with the plug! And also find a relay with the "87a" terminal.
Forgot from which site I copied it from...apologies to the original author!
70' Datsun 240Z __________________ 91' Honda civic wiper motor
blue/white-------pin 85 ________ Pin 87A-------blue/white
blue-------------pin 87 ________ pin 30--------blue
Blue/red-----------pin 85-------pin 85----------green/black
Black----------------------to------------------black
Blue/yellow----------------to-------------------blue/yellow
"There were some diagrams that he posted on post #22 for Hella relays, and some other types,
and these showed the connections. From the harness in the car, it goes into the relay, and
then from there into the new harness for the Honda motor. There are a couple terminals as
showen above that don't go to the relay and go straight through also.
When I did it, it helped to draw up exactly what I needed to do on a piece of paper
showing the wires going from one point to another. My setup is slightly different
because I'm incorporating a delay wiring circuit that I still need to build, but
overall this conversion is pretty easy and works well."