TIL about FiraGO. Togther with Fira Math, it makes for a perfect combination of fonts for handouts and slides. Now, it’s a matter of adding the following declaration in my $\LaTeX$ preamble:
\documentclass[presentation,9pt]{beamer}
\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
\setmainfont[Numbers={Tabular}]{Fira Sans}
\setsansfont{Fira Sans Condensed}
\setmonofont{Fira Code}
\usepackage[mathrm=sym]{unicode-math}
\setmathfont{Fira Math}
\usepackage{lstfiracode}
And it works perfectly well using Emacs Org export facilities!