It appears that that isn't a Go To Layout that accepts a level name or level number. So you're out of luck :( The expression is System.Go To Layout but it doesn't accept and expression like name or number. I'm a bit sleepy so i could be wrong :D
To improve this all i suggest the ability to set the layout flux at edit time like MMF2. So that would exist an screen on which you would arrange layout loading order. So you could do System Go to Next Layout or System Go to Previous Layout. And add an expression Next Layout Name and Previous Layout Name or something like that. A simple Go To Layout is insufficient.