It would be relatively simple for FFG to release rules cards much like they already have for all the special mechanics currently in the game.
Missile Attacks: When you perform an attack with a missile secondary weapon, if this attack hits, in addition to any other effects, the target suffers all damage rolled as if the defender had zero Evade results. If the missile card text states to cancel all dice results, that effect overrides this rule.
Torpedo Attacks: When you perform an attack with a torpedo secondary weapon, the defender doubles their Agility against the attack. If the attack hits, double any remaining hit or critical hit results before applying damage.
Missile attacks then become very reliable, even against high-agility targets, and torpedo attacks are easier to defend against but hit like trucks when they connect.