That should absolutely work!
The only thing it could potentially do bad to your site is that it would mess up the tables and make the page look all screwy if you put it in the wrong spots
It would not stop any queries or code from running.
Make a backup of your postbit file. Like cut it all and paste it to notepad and save it.
Then mess around.
As long as you
make a backup, you can't really go wrong in fiddling around with the postbit templates.