you could... but you'd have more travel with different shocks. it kinda depends on what you do with it, where you go, how hard, how fast.
they're not cheap, but consider the ACOS adjustable spacers. lots of flexibility there for future upgrades or eventual sagging. got 'em on my rig, love 'em.
You can do that if you installed longer shocks when the 3" lift was installed. The shocks down-travel will likely be limited should you take the Jeep offroad.