The idea is really nice, and some replyes even adds some more brilliant ideas.
I'm sad to put an example that perhaps don't help but we have to have in mind;
If i'm not wrong 5K zoners can't land on house planets / stations. Since i'm here i only have seen 1 or 2 times zoners ccoperating to trade in house space (5k transports + freighter or small transport).
Said that, perhaps if this was aplyed to all transport would make change the players mind. Who knows ^.^