> Your example code wasn't helpful because a) it had no grace notes in it and 
> b) it didn't show what you tried that didn't work.
>
> Is this what you wanted to do?
>
> %%% Start
> \version "2.24.4"
>
> startGraceMusic =  {
>   \override NoteHead.font-size = -6
> }
>
> stopGraceMusic =  {
>   \revert NoteHead.font-size
> }
>
> \relative c''' {
>   \time 2/4
>   \grace { a32 e f } e8 c \grace { g'32 c, d } c8 \grace { a'32 } b,16 \grace 
> { d32 } a16 |
>   \grace { g'32 c, d } c8 \grace { a'32 } b,8 \grace { g32 d' g, e' } b8[ 
> \grace { g'32 f } g8] |
> }
> %%% End

That and more: That's what I tried first and it worked, but I also
want to shorten the stems and possibly thin the beams, and it made a
mess when I tried (with various values):

%%% Start
\version "2.24.4"

startGraceMusic = {
  <>(
  \override NoteHead.font-size = #-7
  \override Stem.length = #4
  \override Beam.thickness = #0.4
}

stopGraceMusic = {
  \revert NoteHead.font-size
  \revert Stem.length
  \revert Beam.thickness
  <>)
}

\relative c''' {
  \time 2/4
  \grace { a32 e f } e8 c \grace { g'32 c, d } c8 \grace { a'32 } b,16
\grace { d32 } a16 |
  \grace { g'32 c, d } c8 \grace { a'32 } b,8 \grace { g32 d' g, e' }
b8[ \grace { g'32 f } g8] |
}
%%% End

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