\definepagechecker
  [whatever]
  [lines=35,
   voffset=10pt,
   before={\vfill\wordright{(see next page)}\par},
   after=\noindentation]

\setupindenting[yes,9pt,first]

\starttext
    \noindentation
    \input knuth\par
    \input knuth\par
    \noindentation
    \input knuth\par
    \checkpage[whatever]
    \input knuth\par
    \input knuth\par
\stoptext

