I would go for something similar, like switching totally off the possibility of deleting/editing a post (and not after an hour, but totally), no delete/edit for a week from now, and that would clearly show who are the bumping users and how they do this bumping service.
It won't hurt really nobody except the bumper spammers (and it won't need much coding)
Someone who has a really good reason to delete a post, can ask for it in the Meta (or report itself to a moderator)...