I don't know about sandbox much. I want to ask you this question: Can changing or reordering competitive keywords help a site to go out from a sandbox sooner? If can, we can change again the keywords after the site is not in sandbox. What do you think about this logic?
IMO, then after you change the keywords back to the original, you will probably just go back in the sandbox extending the sandbox period...
see it doesnt metter however if you update your content on regular basis and also work for link popularity then you can get out soon.