As a side why is that? I'm sure if they can control the print head so accurately using a DC motor with an encoder why not on the scanner?
Anyway, with the Lexmark's scanner step motor I now have two both with 4 wires. They're pretty small but through their gearing stepping down quite a lot they should have enough torque to move the print head and the table,.. or so is the plan :)
I like the metal bridge so I'm going to see if I can modify it to take the stepper motor with it's gears... stay tuned.