Found a workaround: The idea is to use \csname …\endcsname with two delimiters
not likely to be used in math mode, below chosen to ‘…’.
But then there seems to be a bug in the LuaTex \letcharcode command: There must
be a character between “$” and the first occurring \activecatcode letter.
Possibly this also causes a bug in \startformula, as discussed before.
\setupbodyfont[xits,10pt]
\setupmathematics[lcgreek=normal, default=normal]
\def\usemathcommand#1’{\csname #1\endcsname}
\appendtoks
\catcode`‘=\activecatcode
\letcharcode `‘ \usemathcommand
\to \everymathematics
\definemathcommand[𝐝𝐢𝐦][nolop]{\mfunction{𝐝𝐢𝐦}}
\starttext
Note that $ ‘𝐝𝐢𝐦’ 𝑉 = 𝖫$, although $\dim 𝑉 = 4$.
And a bug: $‘𝐝𝐢𝐦’ 𝑉$.
\stoptext
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