Nope; beyond the search menu itself, there is no way to do a mass search and replace. We can do mass purge, but that's typically not desirable either.
I can discuss temporary permissions, but I'd guess that the consensus with the powers that be will be a no. And unfortunately with near 500 posts I can't see any moderator going through each one either. There is a way that I can think of though that would work. If you search for your own posts (via the search menu you can select individual posters), and provide it the criteria you are looking for (I don't know if the search menu assumes an OR or an AND, so you may need to do many searches), then you can at least see post by post. You can then use the report option to indicate what you want removed.