2.24 medium = \normal-weight in 2.26

Is there a way of putting something like
 medium = \normal-weight
in a header file to convert from uses of \medium in markup in LilyPond
2.24 to pass 2.26 (so as to aviud going through physically replacing
\medium with \normal-weight?)
The above doesn't work, I guess because it's being invoked inside
markup...
Here's an MWE
%%%%%%%%%%%%%%
\version "2.26"
%medium = \normal-weight
{
  
  c''1
       \mark \markup {\bold { bold \medium unbold1}}
             
 c''1
       \mark \markup {\bold { bold \normal-weight unbold2}}
}
%%%%%%%%%%%%%%
Only the second markup is valid in 2.26 and uncommenting the definition
doesn't make the first valid.

Richard