While those aren't from Unearthed Arcana, they
are official flaws. Dragon Magazine is 100% Official D&D 3.5 Content, it says so on the cover
But yes, out of Unearthed Arcana ones, a noncombatant is best simply taking Noncombatant and Murky-Eyed. I do not recommend Unreactive, because if you
do get into a fight and you're not specced for combat, going first can let you
run away before the enemy has their turn.
Why Murky-Eyed instead of Shaky? There are plenty of uses for ranged attacks that don't need you to be a combatant. Dart games in taverns, passing your friend an item, or slinging rocks from behind cover if you are put into a situation where your combatant friends are busy and you need to pass the time. Not all enemies will have Concealment.