If you have the name of the font you want to use in the LaTeX fragments, have you tried using a LaTeX header at the top of the file, e.g.
#+LaTeX_HEADER:\usepackage{mlmodern}
(Replace mlmodern with whatever typeface you prefer)
If you don’t want your .org file to become too cluttered at the start, you could alternatively use a setup file via #+SETUPFILE: /path/to/setup-file.org – create an org file e.g. setup-file.org, and include a line like
#+LaTeX_HEADER:\usepackage{mlmodern}
or whatever your fixed-pitch/monospace font is supposed to be, as well as all the other options you want to use for LaTeX (like other \usepackage declarations, \newcommand definitions etc.).
If you have the name of the font you want to use in the LaTeX fragments, have you tried using a LaTeX header at the top of the file, e.g.
(Replace
mlmodernwith whatever typeface you prefer)If you don’t want your
.orgfile to become too cluttered at the start, you could alternatively use a setup file via#+SETUPFILE: /path/to/setup-file.org– create an org file e.g.setup-file.org, and include a line likeor whatever your fixed-pitch/monospace font is supposed to be, as well as all the other options you want to use for
LaTeX(like other\usepackagedeclarations,\newcommanddefinitions etc.).