[Suicide Junkie]

If you set a location where the ship is purchasable, you merely have to go to one of those locations and buy it.
(If you are already at the location, it won't update until you go somewhere else first)

Some files are reloaded during the game, and some aren't.
Maps don't... the campaign missions/triggers probably don't.
Components, stores, slotlayouts (not for existing ships, only new ships), and others do.