Getting back to reality, I see no need for QFE.
If you were a sailplane pilot you probably would see a need. When working out if you can reach your destination on a glide your key numbers are your height above the airfield, the distance to run and your current glide angle. With a performance of 45:1 you can cover a little over 7 nm per 1,000 feet so to get there with 1,000' spare to do the circuit and landing you need to be at or around 2,000' QFE with 7 miles to run or 3,000 at 14 nm. Trying to do that calculation based on QNH just complicates the issue.
Eurocontrol Definition of Aerodrome Reference Point
The aerodrome reference point shall be located near the initial or planned geometric centre of the aerodrome and shall normally remain where first established.
Eurocontrol Definition of Aerodrome Elevation
The vertical distance above Mean Sea Level (MSL) of the highest point of the landing area.
Hence the aerodrome elevation is not necessarily determined at the reference point.