I would do it. A win is a win, and its your opponents fault for not picking up a kicker sooner
There are alot of things that would fall under this same category, and while questionable, things like this are legit tactics to help win.
One example of something similar that people do sometimes, and I did this last year, is to porposely throw a game in the end of the regular season, in order to change your playoff seed, and in the process putting you against what you preceive as the weaker opponent.
like was already said, managing the free agent pool is part of the game,
"He walks amoung us, but he is not one of us."