Holding an EGM is a major hassle and expense (and my guess is no one would turn up).
However, it would be much better than our system whereby the chairman approaches people privately and doesn’t announce the candidates for election by the EC only until after the matter “to save the embarrassment of those who aren’t elected”.
Currently all but one member of our seven-strong EC was appointed mid-term in this way. Guess how often the chairman doesn’t get his way.