How would one specify the font size in LMTX, but via x-height?

You could try this:

    \starttexdefinition setxheight [#1][#2]
        \switchtobodyfont[#1, 12pt]
        \switchtobodyfont[#1, \cldcontext{tex.sp"#2" / tex.sp"1ex" * tex.sp"1em" .. 
"sp"}]
    \stoptexdefinition

Demo:

    \starttexdefinition setxheight [#1][#2]
        \switchtobodyfont[#1, 12pt]
        \switchtobodyfont[#1, \cldcontext{tex.sp"#2" / tex.sp"1ex" * tex.sp"1em" .. 
"sp"}]
    \stoptexdefinition
\define[1]\sample{%
        \setxheight[#1][10pt] Hello%
    }
\setuppapersize[letter, landscape] \starttext
        \dontleavehmode\rlap{\vrule width\textwidth height 10.5pt depth -10pt}%
        \processcommalist[modern, pagella, termes, heros, bonum, scholas, 
adventor, cursor, chorus, dejavu]\sample
    \stoptext

This is kind of a hacky solution though. It works reasonably well,
although there's likely a better (perhaps builtin?) way to do this.

-- Max
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