Hyperion techs are available to races with the Starfaring ability. I think the Arceans have it, or you could use it with a custom race.
Starports are not available to synthetic races, or those with the Zealots ability. What race are you playing as?
And yes, you can add a commander to any fleet. It add a "command ship" to the fleet, and you get greatly increased moves and some extra logistics for that fleet. Definitely worthwhile.