I would have thought that all commercial pilots who may be involved in operating pressurised a/c ought to have had practical training concerning hypoxia
I'd like enthusiastically to second that ! I have also had the good luck actually to experience depressurisation followed by hypoxia, but in a controlled environment for training purposes. 1986, when AMTC was located at North Luffenham !
The really frightening thing is that you get ZERO warning or prior awareness when you are drifting into potentially fatal hypoxia. I'd agree that a much increased awareness even of the possibility should be an essential part of the initial and recurrent training of all crews operating pressurised aircraft.
It's worth noting that this is one of the few areas which cannot be realistically practised in simulators, which, however sophisticated they may be, never leave the ground !