Again this has been partly discussed on the list and solutions were already there but I didn't see anyone mention the issue with figures.

In the following MWE we have 20 pages of a simple text with a section, a footnote and a figure on each page.  The page numbers and footnote numbers are fine.  Section numbers need some care to appear correctly.  I couldn't figure out a similar mechanism for figure numbers, though.  The example does not use Indic numbers, which does not have any effect on the problem.

\setupdirections[bidi=global,method=two]
\setupalign[r2l]

%% If we don't provide the numbercommand, we'll see reverse numbering starting from 10.
\setuphead[chapter,title,section,subject][numbercommand=\righttoleft]
%% The following does not accept any numbercommand but it has numberconversion.
%% As a result figure numbers are shown in reverse.
\setupcaptions[numberstopper={:}]
%% Footnotes are fine and accept conversion.
%% Page numbers are also okay.

\starttext

\dorecurse{20}{

\section{Test}
This is a very simple text.
And we have a footnote\footnote{Footnote text}.

\placefigure
[][]
{Test figure.}
{\centerline{FIGURE BODY}}

\page
}

\stoptext