I propose a GP only artifact that allows the player to reacquire modules that they sold. This means that if someone is willing to pay hard earned cash for their dreadful mistake of selling their psionic amplifier, they can do it. It isn't game breaking to allow the player to get back something that would have been theirs anyways.

Yeah, say you sell a mission only artifact by accident (misclick or whatever), I think it's fair to be able to get your old modules, excluding normal ones you can buy since that's not a big deal. Not sure how you would do it retroactively tho, except checking that mission was completed a certain number of times but the module count isn't in cargo or the ship.