Gear Shift Motor

(l-r) 12v motor, 3/4" PVC coupler, ~4" of 3/4" PVC, Tama brand double kick drum pedal universal joint connector, 3' 1/4" threaded rod

So my idea is to position a 12v motor beneath the gear shift lever (which is on the steering column) pointing up. The shaft of the motor will be extended to a threaded rod. A nut (or equivalent) on the threaded rod will be attached to the gear shift lever. As the motor spins the nut will travel vertically, causing the lever to shift up and down thus changing the gear.
I have the motor and have been able to extend the shaft quite a long ways. Since any given point on the gear shift lever travels in an arc I need to compensate for this. While thinking about universal joints I noticed my old Tama double kick pedal (that I recently replaced with the superior IRON COBRA!!!). It has two U-joints and an extendable shaft: perfect! Now I just need to figure out (1) how to mount a 1/4" nut onto the gear shift lever and (2) how to defeat the "safety" mechanism that requires one to pull on the gear shift lever before one can shift into another gear.

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