It is not impossible, but watch out for all the small parts inside the governor. If you can get hold of the axle bearings of the auxiliary mechanical governor, replace them too.

You need a dial measurement device to set the compensation path:





And here in reality, slightly improvised:



Read about replacing the membrane in the FSM/WIS and follow all the steps:

07.1 Diesel Injection System - OM616

there 07-215

Attaching the membrane to the control rod is the most complicated, certainly with the diesel pump still on the engine (and the engine in the car).