"BTIZ" writes:

you can't set QFE when the field elevation is that high above sea level

Perhaps not on a regular (civilian) aircraft altimeter, but given the
number of toys that are part of a typical military bird it would seem
that something as simple as a parachute jumper's alitmeter (which *is*
designed to be set to QFE) would be a good, inexpensive way to do
a sanity check on altitudes used in low-level aerobatics.

Joe Morris