Oh, and as a summary for anyone who finds themselves in a similar situation.
In this case, the stuck propeller was due to corrosion on the motor spindle. Rust does a double whammy--it takes up more space, and is much rougher than polished steel...
From 2000 ft, the plane wouldn't have seen your drone or had any way to know you were flying there.
The minimum safe altitude rules allow flight below 500 feet in sparsely populated areas and over open water, so what would you report the pilot for?