\defineconversionset[frontpart:pagenumber][][romannumerals]
\defineconversionset[bodypart:pagenumber] [][numbers]
\defineconversionset[appendix:pagenumber] [][Characters]

\setupuserpagenumber[numberconverionset=pagenumber,way=byblock]

\setupheadertexts[Page \userpagenumber\ of \lastuserpagenumber]

\starttext

\startfrontmatter

    \startchapter[title=Fontpart]

        \dorecurse{20}{\input knuth \footnote{test}\par}

    \stopchapter

\stopfrontmatter

\startbodymatter

    \startchapter[title=Bodypart]

        \dorecurse{20}{\input tufte\par}

    \stopchapter

\stopbodymatter

\startappendices

    \startchapter[title=Appendix]

        \dorecurse{20}{\input zapf\par}

    \stopchapter

\stopappendices

\stoptext
