So you're saying you only have manual locks on the driver side? I guess I'm reading something incorrectly.
I used to have an '88 Honda Crx and installed something like this (mine didn't have all the frills):
http://cgi.ebay.com/2-DOOR-POWER-LOC...QQcmdZViewItem
It was cheap and easy. The hard part was finding a place for the actuator so everything moved smoothly. I wonder if you could find a newer wrecked Rodeo and just swap the internals. BUT that's a lot of wiring to deal with.