One issue is that the overlay overlaps the text space (reduces whitespace or
potentially overlaps letters). One could use a blank row with a black
background, but a row seems to have a minimum height of about 2mm. I
discovered the "boffset" key, which can be used with the overlay, but it's
kludgy.
Perhaps there is a better way...
Michael
\startuseMPgraphic{MP:thickBtm}
draw bottomboundary OverlayBox withpen pensquare scaled
\frameddimension{bottomrulethickness};
clip currentpicture to OverlayBox;
setbounds currentpicture to OverlayBox;
\stopuseMPgraphic
\defineoverlay[OL:thickBtm][\useMPgraphic{MP:thickBtm}]
\starttext
\bTABLE % Overlay method
\setupTABLE[align=middle]
% By eye, by trial: boffset = bottomrulethickness/2 - 0.2mm
\setupTABLE[header][background={OL:thickBtm},bottomrulethickness=3mm,boffset=1.3mm]
\setupTABLE[row][4][background={OL:thickBtm},bottomrulethickness=1.5mm,
boffset=.55mm]
%
\bTABLEhead\bTR\dorecurse{3}{\bTH#1\eTH}\eTR\eTABLEhead
\bTABLEbody\dorecurse{6}{\bTR\dorecurse{3}{\bTD#1-##1\eTD}\eTR}\eTABLEbody
\eTABLE
\stoptext
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