With practice, you will develop a feel for when your rudder begins to stall/ cavitate and you won't need any sort of artificial limiter, your reflexes become the limiter.
Here's something you can try- relax the angle of the pedals so they are flush with the footplate, or even tilted slightly towards the bow, away from you. The 550 is such a reactive boat that you don't need much pressure on the pedals to execute big direction changes.