Ted, when there is an emergency all 'normal' operating procedures go out the window and you do what you need to do to save your a$$. In a time critical event if that is the closest piece of ground then "your" special training ie: as a cockpit crew is all that is needed to get you safely on the ground.
In a non- time critical situation then you can take the time to evaluate whether that high altitude airport is indeed suitable for your situation but I wouldn't take the fact that I have never had special training as a factor in making my decision.
Use common sense