I have grabbed the motor, controller and switch set from a 2004 -07 Jaguar XJ series car to actuate the park brake calipers on a set of Willwood brakes.. not fitted the cable ends as yet but the bracket was v simple to add. It all sits under the floor, total cost was around $350.
The option you have identified looks great..
is just a question of space to mount the motor.
Cheers
Chris