HULL MA SLOPE indicator?

 

I am looking for an idicator which shows (as an oscilator) the SLOPE STEEPNESS of a Hull Moving average. My intent is to experiment with entering on the first pullback where the SLOPE (Rise / Run ) is 1 or greater.

Please note that I am NOT looking for the "Slope Trend Indicator" which is really a Hull Moving Average which shows only trend UP or trend DOWN. I want to measure STEEPNESS of the Hull MA. (also called Zero Lag MA)

Thanks for any input or suggestions!