Make them immobile stationary storages/stations as they were ment to be, without ability to be used for jumping. Add docking bay slots for it to act as the station.
Barge jumping takes away the possible eight 5ker passes to the sell point and back, thus actually decreasing chances for player-player encounters. This in return can lower activity for everyone, including official factions that must uphold those 30h.
When I play my pirates, I want to encounter shippers. I don't want to sit in one place untill bunch of lawfuls come.
And if this happens, remove the drift after disconnecting with them. It would be a pain.