Out of all of the beloved B-wing pilots, Keyan has the best ability.
Being able to spend a stress token to generate more offensive capability is fantastic. Keyan works really well when paired with stress inducing mechanics such as Push The Limit and Stay On Target. If you're working off Push The Limit, Advanced Sensors and Engine Upgrade can both be interesting although expensive options. There is no getting around it however, no matter what you do with Keyan, it will end up expensive.
Jan Ors is a cool upgrade for Keyan, granting an evade token every time you take a focus action, giving the B-wing a free hit point each turn. Also combined with Rage and Advanced Sensors, you can use Rage first, turn the focus token to an evade token, use a green manoeuvre to clear the first stress token, then spend the second on the upcoming attack roll.
Opportunist is another EPT worth considering, but you'll need another pilot such as Wes Janson to ensure you're stripping the target of focus/evade tokens.