Are these, in both cases, expected and useful within basic (monotonic) Greek coverage?
What do we know about what these things should look like?
Is the descending piece supposed to be more akin to, say, an italic /g tail, or an ogonek?
The form of the lowercase should always follow suit of /kappa, I presume?
It sometimes appears with a grave-like diacritic--any guidance on when it should or shouldn't, and what that should look like if different from a gravecomb?
Bonus points for good info on the use and shape of Greek numeral signs U+0374 and U+0375