one mix could be a mix between my idea and the legion planet/system thread
it requires an upkeep that "feels" for 3-4 players but it ok-ish for a whole legion depending on level, same with ship upkeep
one legion needs a system/planet to build a legion warehouse, and the more warehouse levels the more upkeep, and if the legion "bank" doesnt have the required upkeep each day/week, random artifacts gets destroyed to "pay" for the upkeep, so its beneficial for the legion to pay for the upkeep rather then having random items mangled thru the random artie-bustah method

Another added idea could be the more artifacts stored in the legion warehouse the higher upkeep (proportional) it would be.