A random idea popped into my head today when thinking about the 200 point games coming with the new expansion box and the custom commanders they mentioned. What if there was a generic unnamed commander whos' abilities were the fleet commands cards.
Example "Imperial Commander" "At the start of the ship phase, you may spend a consecrate fire token. If you do, until the end of the round, while each friendly ship is attacking a ship, it may change 1 die to a hit icon and no other icons." and with that keep it the same cost as a fleet command.
I know this would make actual ships that use fleet commands not as needed but could be a possible way for a generic commander for smaller games.