TylerBkk1 wrote
if I can somehow convert or reverse engineer the curves adjustment layer into a levels adjustment layer
You can't. Levels is a subset of Curves - it creates one particular curve, a gamma curve.
You should really try to make friends with Curves. It's vastly more powerful than Levels. I agree that Levels is often much more convenient for setting the endpoints, but for anything that goes on in the middle it's very limited.