Different size fontpage

I try to get a double page size cover page for a book with an oversize for
the cover page and all other pages. The following example does not create a
double size cover page. Is there a proper way to achieve this?

\definepapersize

  [320x240]

  [width=320mm,height=240mm]


\definepapersize

  [160x240]

  [width=160mm,height=240mm]


\setuppapersize

  [320x240]

  [320x240,oversized]

  \setuppapersize

  [160x240]

  [160x240,oversized]


\setuplayout

  [backspace=18mm,

   width=129mm,

   topspace=10mm,

   header=2mm,

   headerdistance=2mm,

   height=223mm,

   cutspace=30mm,

   footerdistance=4mm,

   footer=5mm,

   bottomspace=5mm,

   location=middle,

   cropoffset=0mm,

   trimoffset=-3mm,

   bleedoffset=3mm,

   marking=on]

   \starttext

\startfrontmatter

\page \setuppapersize[320x240,oversized]

\setupfooter[state=stop]

Cover Page \vfill bottom

\page \setuppapersize[160x240,oversized]

\setupfooter[state=start]

\startchapter[title=Chapter]

\input tufte

\stopfrontmatter

\stoptext

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