slashed afterGrace?

[Stan Sanderson]

How can I obtain an an acciaccatura-style (slashed) grace stem with 
\afterGrace? Much searching has failed to find an answer. Help appreciated! 
Thanks, 
Stan

\version "2.23.3"
\include "english.ly"
\relative c
  {\clef bass
      <<{ <b' fs>2 \afterGrace 3/4 <as e>2  <as e>8( |  <fs d>1) }
     \\
      {<d b>2  \afterGrace 3/4 <cs fs,>  <cs fs,>8( | <b d,>4)( <as cs,>4 <fs 
b,>2) }>>
  }

Sorry for the length of the code, but thought it would clarify the request.