A37575, while I can agree with you that manners are a good thing, I have to say I'm kind of with Nubboy on this one. Or perhaps I don't really understand the question?
The designated alternate should be the same on the operative documentation as on the ATC flight plan, and you should have (checked) NOTAMS for your diversionary airfield. If the commander wishes to change the alternate, it should be done so on the ATC flight plan too. If you simply want "more outs" for comfort, then fine; don't put it in the flight plan, but I see checking notams just as essential as checking weather and comparing it to your approach plates to have a plan.
