How about some building on the Pathfinder base?
Pathfinder Reflexes Feat 10
Archetype Pathfinder Agent
Prerequisites Pathfinder Agent Dedication, Environmental Explorer
Pathfinders train to stay alive when things get rough and the traps start springing. When you roll a critically fail a Reflex save, you get a failure instead. In addition, when you roll a success on a Reflex save, you get a critical success instead.