It seems like a lot of hassle as someone else's post would have to be deleted in order to make room for mine so I think that I will just add the info I planned in that first post.
Talk to theymos first. Send him a PM and check what he has to say. He isn't going to delete a random post and give you the ID for it. He will give you the ID of a post that was already deleted in the past for whatever reason. It worked in my thread, maybe it will in your as well. If theymos can't do it, he will let you know.