tested with Font Awesome Pro 5.8.2 (also works with Free)

Just in case I forget:

1.- Download Webfonts package
2.- Visit http://fontello.com
3.- In Finder, navigate to folder Webfonts,
drag & drop fa-regular-400.svg into fontello
4.- In name, enter anything, I used fontawesome-pro-reg-5_8_2.svg
(just remember to use lowercase and no spaces)
5.- Drag mouse to select ALL icons in section Custom icons (unintuitive, I know), takes some seconds for the browser to become responsive
6.- Download button becomes enabled 😄 , download! takes a couple seconds to start, wait for download to finish.
7.- Click Clear custom icons
8.- Repeat steps 3-6 with fa-solid-900.svg
9.- Install TTFs,
10.- In Sketch install SVGs
11.- Profit!

Based on a comment by @mamuts12 in #170 (comment) 💯