Not only would that be a bad idea in general, it would also violate the NDA in addition to the SE account TOS.
It would be very unlikely that anyone in beta can't play the game mainly because you put your computer spec on your application. Now they will chose some low end specs to see how they do and if possible make some graphic scaling to see if this low end model can run it. SE isn't dumb and they know it' in their best interest that people with current computer run FFXIV on the lowest settings right now.
If pressing the back button on your browser (go on, do it) is any indication, there -are- some people who got accepted and can't run the beta.
As much as I would honestly love to have beta access in place of someone who got in and can't get in, I wouldn't want them to violate the ToS to do it.
However, if something were to show up in my PMs, I wouldn't look a gift horse in my mouth.