[NTG-context] Playing with math font setup

["Ali Ali" <111414w@gmail.com>]

Hi, hope everyone's doing well!

Is it possible to setup math font so that all the basic ascii characters (i.e. a..zA..Z0..9) glyphs are substituted with current serif (or sans) font. I tried playing with fallback thing but it didn't got me anywhere!

e.g. $x$ will use the 'x' glyph from current serif italic font, and $\bf x$ will use the 'x' glyph from current serif bold font!
I would appreciate any suggestions and help!

Suppose we have all the required font files in the 'font' directory of the working directory, and below is the minimal source code! 
"""
\starttypescriptcollection[CustomFontSelection]
  \starttypescript [serif] [CustomFontSelection] [name]
    \setups[font:fallback:serif]
    \definefontsynonym [Serif]
        % [file:font/Lora-Regular.ttf]
        [file:font/Lora-Medium.ttf]
        [features=default,fallbacks=Serif]
    \definefontsynonym [SerifBold]
        [file:font/Lora-Bold.ttf]
        [features=default,fallbacks=SerifBold]
    \definefontsynonym [SerifItalic]
        % [file:font/Lora-Italic.ttf]
        [file:font/Lora-MediumItalic.ttf]
        [features=default,fallbacks=SerifItalic]
    \definefontsynonym [SerifBoldItalic]
        [file:font/Lora-BoldItalic.ttf]
        [features=default,fallbacks=SerifBoldItalic]
  \stoptypescript

  \starttypescript [math] [CustomFontSelection] [name]
    %%% \definefontfallback [MathRomanFallBack]
    %%%     [SansItalic]
    %%%     [extendedlatin]
    %%%     [force=yes] 
    \definefontsynonym [MathRoman]
        [file:font/STIXTwoMath-Regular.otf]
        [features=math,fallbacks=MathRomanFallBack] 
  \stoptypescript

  \starttypescript[CustomFontSelection]
    \definetypeface [CustomFontSelection] [rm] [serif] [CustomFontSelection]    [default] [rscale=0.9]
    \definetypeface [CustomFontSelection] [ss] [sans]  [newcomputermodern-book] [default]
    \definetypeface [CustomFontSelection] [tt] [mono]  [newcomputermodern-book] [default]
    \definetypeface [CustomFontSelection] [mm] [math]  [CustomFontSelection]    [default] [rscale=0.97] 
  \stoptypescript  
\stoptypescriptcollection

\setupbodyfont[CustomFontSelection] 


\starttext

We use $X$, $Y$, $Z$ and $n$, $m$, etc. $\sin(x) \to \limsup x_n$ whatever.

\mathematics{%
  \delta_{ij} =
    \startmathcases
    \NC 1 \NC \text{if } i = j \NR
    \NC 0 \NC \text{otherwise} \NR
    \stopmathcases
}

We use $\bf X$, $\bf Y$, $\bf Z$ and $\bf n$, $\bf m$, etc. $\bf \sin(x) \gets \limsup x_n$ whatever.

\stoptext
"""

Best regards,
Ali
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