This is as close as it gets, as far as I know. It's 1 day/lvl, so you'll have to occasionally refresh it, and it is Illusionary and Mind Affecting (and so lots of things will ignore it). This is one of the most underrated/overlooked spells in the game though, IMO.
I saw a thread talking about making giant billboards of it once, but that's about all of the mention I've seen of it, and I've never seen it actually used in a game, sadly.
Edit: Let me elaborate on the "trick" here... you don't actually care about the "hidden" message. You're only going to "abuse" the Suggestion part of the spell. So you make a giant sign that says "GO AWAY" with the Suggestion triggered being "Go away and forget you ever saw this place". (Or if you're opening a new burger joint, and want to drum up business, make a giant sign over the city that says "Eat At Joes!"
)