\version "2.22"

#(define page-in-header #t)

\header {
  motto = "Some motto"
}

\paper {
  print-all-headers = ##t
}

#(define (page-in-header? layout props m)
   (if page-in-header
       (interpret-markup layout props m) empty-stencil))

#(define (not-page-in-header? layout props m)
   (if (not page-in-header)
       (interpret-markup layout props m) empty-stencil))

\paper {
oddHeaderMarkup = \markup \on-the-fly #page-in-header?
\fill-line {
  ""
  \on-the-fly #not-part-first-page \fromproperty #'header:instrument
  \on-the-fly #print-page-number-check-first \fromproperty #'page:page-number-string
}
evenHeaderMarkup = \markup \on-the-fly #page-in-header?
\fill-line {
  \on-the-fly #print-page-number-check-first \fromproperty #'page:page-number-string
  \on-the-fly #not-part-first-page \fromproperty #'header:instrument
  ""
}
oddFooterMarkup = \markup {
  \column {
    \fill-line {
      %% Copyright header field only on first page in each bookpart.
      \on-the-fly #part-first-page \fromproperty #'header:motto
    }
    \on-the-fly #not-page-in-header? \fill-line {
      ""
      \on-the-fly #print-page-number-check-first \fromproperty #'page:page-number-string
      ""
    }
  }
}
}

{ \repeat unfold 50 { c'1 c' c' c' \break } }