I took a new look at Font Awesome, and I think I have a good way forward for the code tags icons (block and inline code tags):
- Replace the main code tag icon "code" with Font Awesome (fas fa-code); and,
- Replace the inline code tag icon with Font Awesome (fas fa-terminal).
References:
These are the best choices from the FA icons, as far as I can see (easiest to read, etc).