Honestly? No. I'm not interested in adding a command station with a cap of one to the game.
The only idea I have that would be practical (although boring) is a Fortified Command with as much health as an AI Eye or Wormhole Guardpost, 400 million health, no special traits other than being durable enough to provide supply on isolated systems... and then an exo-galactic strikeforce would pop it anyways. Perhaps a quarter of that health could come from a force field.
Here's an impractical idea: salvage. Take down one of the AI Home Command Stations, you can build/replace one of your command stations with a
Modular Fortress Command Station.
Slightly less impractical: have super command stations provided by the Zenith Trader... and they nuke on death, rendering the system useless.