[NTG-context] switching (named) layouts?

Hi, Is it possible to give a layout definition a name? It would be really helpful to be able to say \definelayout[name=one][...] \definelayout[name=two][...] and then to be able to say: \setuplayout[one] and somewhere else in the document \setuplayout[two] (This would mirror the way it is possible to switch papersizes.) Or is there another way to have different collections of \definelayout settings that can be switched on or off at specific places? What is the best approach? Thanks, Jelle