Using the electronics from a servo to drive a gearhed motor

Hi,
The project I working at is this

Since I could not find a servo with a worm gear I decided to scrap the servo and go with a gearhead motor with a 33rpm speed. Do you think that this can be linked to a hobby servos in-built control electronics with no problem ?
I will be trying to use the servo electronics from a Hitec HS-645MG servo

motor specs:
Operation voltage 12VDC
No Load Current 140mA
Max Current 440mA