If you rename the browser, an OTA update could just replace it. Even if you had a place holder file, it could get replaced. But it is more likely that an update would just brick your kindle. It is NOT safe to make changes like that to the root partition.
It would be possible to install a custom hack using ixtab's jbpatcher, that disables the wifi option from the menu, so that you cannot turn wireless on. But if you have a special offers kindle, just clicking an ad will turn wireless on again.
I do not see anywhere in your posts that you say whether or not you have Special Offers. This is information we need, to decide all the ways of preventing wireless from being enabled.
Requesting custom features like this usually requires you to invest the time needed to learn how to DIY, or to invest the money to hire somebody to do it for you, or ask for somebody else to do your custom work for you for free (hopefully in a more pleasant and convincing manner).
Regarding your request to "provide the appropriate codes to accomplish the goals mentioned", I think you may find the answer to that one here:
http://mattgemmell.com/2008/12/08/what-have-you-tried/