So sad. He is among hoards of people that had their lives altered, if not ruined, by the use of hypodermic syringes being used to flush the outer ear.
There is no way to tell how he will react, but a trial flight might give some clues. He's probably already had a multiplicity of tests to check for his reaction to hot/cold air in the ear, spinning with eye movement logging and numerous other tests. If not, an update on his condition might be appropriate.