In my game with the spanish i did something similar to this, only i just disbanded the unit as i had so many of the and i was so rich. But after i had conquered about 70 to 80 percent of the provinces i just gave up as it is almost impossible to find all of the 25 corrupt governors. So in the end i just let them be corrupt and got on with conquering the world before i ran out of money. i ended up making in with 200,000 of my million left.