What's "hard" is:
An airport that is "nearest" in straight-line distance may not be "nearest" in time.
An airport that may be "suitable" may be marginally so.
Intruder.....and?
The points you make are part and parcel with operating a medium/heavy twin either ETOP's or over some of the more remote area's of the globe in every sense of the word.....like I said...its not THAT hard.
Its why at the route planning stage an airline is required to produce detailed and specific area and aerodrome briefs to enable its operating crews to become familiar with the various suitable/adequate/nearest alternate airfields.
I'm sure you are well aware of this, but perhaps its important to enlighten those who aren't aware.