[NTG-context] How to reset settings in setuphead back to defaults?

[Joel]

I have some settings like this, which define the part, chapter, and section titles within a file that contains all of my common settings for all files.

\definepagebreak[chapterpagebreak][yes, right]

\setuphead[part][style=\sse, placehead=yes, expansion=yes]
\setuphead[chapter][style=\sse, placehead=yes, expansion=yes, page=yes,
                        numbercommand=\groupedcommand{}{\blank[1cm]},
                        alternative=middle,
                        numberstyle=ssl,
                        numbercolor=white,
                        strut=yes,
                        page=chapterpagebreak,
                        header=empty]
\setuphead[subject][style=\sse, placehead=yes, expansion=yes, page=yes,
                        numbercommand=\groupedcommand{}{\blank[1cm]},
                        alternative=middle,
                        numberstyle=ssl,
                        numbercolor=white,
                        strut=yes,
                        page=chapterpagebreak,
                        header=empty]
A problem I have is I need one document to ignore all the above, basically pretend each of these is reset to defaults. Is there a way to rest all of the above items to default settings quickly?
--Joel
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