Override baseline-skip according layout-staff-size

[Rip _Mus]

Hello,
please, take a look:

%%%
\version "2.24.0"

xclefon = {
  \set Staff.clefPosition = #3
  \override Staff.Clef.stencil = #(lambda (grob)
                                    (parenthesize-stencil
                                     (grob-interpret-markup grob
                                       #{ \markup
                                          \override #'(baseline-skip . 0.8)
                                          \teeny \center-column {
                                            \musicglyph "noteheads.s2cross"
                                            \musicglyph "noteheads.s2cross"
                                            \musicglyph "noteheads.s2cross"
                                            \musicglyph "noteheads.s2cross"
                                          }
                                       #})
                                     0.1
                                     0.5
                                     0.5
                                     0))
}

\score {
  {
    c'4
    \xclefon
    c'4
  }
  \layout { #(layout-set-staff-size 16) }
}
%%%

in "\override #'(baseline-skip . 0.8)" I'm trying to scale the
baseline-skip according to the part staff size (16), in fact 16/20 =
0.8. I'd like to make this snippet more generic.
I tried to point, from within the markup, to the Clef grob staff-symbol
property, to get the staff size, but without success.
Could you please help me solve?

Thank you

Rip_mus