Thanks to a friend who gave me the idea, I've taken this:

https://eoval.org/ppUsquXv#

saved it as ``hit🗞 .rst``, run the command ``rst2man hit🗞.rst | man -l -`` and I can indeed confirm that #manpages have no issue with #unicode and emoji (at least if your terminal is configured to show them).

https://eoval.org/fkaao4oP#

(the pastebin urls will self-destruct in a month; I may delete this post at that time, if I remember about it)