In article ,
dlevy wrote:
Can you file the departure airport as the alternate?

Two airports in the middle of nowhere 40 miles apart. I can't think of
another reasonable option.

Sure you can file your origin as your alternate. There's no reason
not to. All an alternate means is someplace you've pre-computed you
should (according to specific criteria laid out in part 91) be able to
get into if your destination becomes unusable.

If your goal is to get someplace, turning around and going back home
may not be very useful, but it's certainly legal.