You'd be mad to take the pay cut from what you're on now.
Top LAE increment is £36k + Shift pay.
Max shift pay is £6k for permanent nights - a lot less for more sociable patterns.
As a new starter you'd be on low LAE increment of at least £3-4k less.
Even if you were to come back as an AMS you'd still be looking at a pay cut of a few thousand a year.