How can I clip long markings in the header?

See this MNWE, where the two copies of section title collide on page 3.

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\starttext
\setupbodyfont[20pt]
\setupheadertexts[section][section]
\section{One}
\section{Two}
\page
\section{Three}
\page
\section{Long Title for Section Four}
\page
\section{Five}
\stoptext

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How can I clip the title to a fixed length (5cm?) and perhaps add "..." at the end for longer titles?

Is it possible to provide an alternative shorter section title within \section?

Thanks,

Mohammad