Change Colony Upgrade

Unfortunately you're stuck with what's assigned and there's no easy way to get rid of it. Only way to get rid of it that I know of is to assign a governor to the planet, delete the thing and then remove the governor. Though I haven't checked if you can reassign an improvement.

EVEN MORE annoying is the fact that the AI always uses that sensor upgrade.

Quoting smjjames, reply 1

EVEN MORE annoying is the fact that the AI always uses that sensor upgrade.

Yeah. There seems little point in surveying anomalies when every upgrade you might find is useless because every planet in the galaxy already has a sensor upgrade.

Very frustrating when you invade a colony and find a techapod hive (or similar rare resource) and you can't build an orbital harvester because the AI has already built a sensor upgrade.

Wondering how I'd go keeping a Tywom citizen on hand to assign to colonies as governor long enough to delete the current upgrade and then sacking them again?

You can keep leaders indefinitely after purchase without assigning them. To kill the improvement you want gone simply click on it you will get an option to destroy it. Then fire the leader. You then should be able to select a new build for the colony. Might take a turn or three however never tried it myself. 

Every firing makes the leader more unhappy so you don't want yo use someone you can't afford to execute when the time comes.

Too dangerous if you cant assign, destroy and fire in one move as they may swap sides if given a chance.

You can just stuff those into a faction. There's no consequence for having a red level loyalty leader in a faction as far as I can tell.

Could even be an advantage I guess if the faction is a problem and you stick an incompetent leader in there?

I've not actually used factions yet.

There's no leader related faction events yet and the leaders have no effect outside of the modifiers for the faction. It's also a nice spot to stick future potential governors.