So let me fully understand this here, you DO have a CSEL rating on your commercial certificate, but you haven't flown any single engine planes in a couple years and you're just wanting to get current so you can find a job flying a Pilatus or Caravan right?
I don't think any checkride will be necessary to my understanding. If anything you could just find a CFI and have them give you a flight review in a single engine airplane and you should be good to go.