So I figure multiplayer format is actually intuitive and already figured in.
Essentially, I think the easiest solution is a clockwise rotation of priority, starting with the initiative player of course, simple enough right? Repeat the clockwise process with everything and it works.
For teams, do an A, B, A, B setup and utilize clockwise rotation for priority, again starting with the initiative player.
For combat repeat clockwise rotation with whoever has or has gained the initiative at the planet. For teams, whoever has or has gained initiative will start the rotation.
Thoughts?
Edit:
As for teams, the harder question is whether teams are seated together or opposite. For seating together, disregard clockwise rotation, instead substitute it with opposite alternation, Player A1 will act then B1 at the opposite corner, then A2 and likewise B2 sitting his opposite. (Opposite is read mirrored.)
Edited by Phaedros