Unless I missed something, "this forum" is very much against members sending merits to their alt accounts.  That's the vibe I've gotten from the beginning of the merit system, that it's a misuse of merits--and it has to be, since merits are supposed to be used to merit good posts, and if you're the one making the post and then meriting it....well, that's obviously not an unbiased opinion of the post's quality.

On the other hand, there's no rule that I know of that says you can't do it (AFAIK).  OP, if you did what you proposed in your scenario, my guess is that no one would ever find out and there wouldn't be any trouble.  I don't think most members would even care if they knew, though I'm sure some certainly would.  The problem with meriting alt accounts is when people do it a lot, with the intention of ranking up an alt account. 

If you were to do that as a way to get around Newbie restrictions, I still find it borderline icky and if I were you I wouldn't announce that you were doing it to the community unless you're prepared to have both accounts tagged.  And I just think it's a bad idea in general (though I don't tag merit abusers and wouldn't tag you or anyone else who merited an alt account for that reason).