@selea Well we basically have little experience with Debian packaging and repositories in general ... Feel free to write / share a tutorial on how to setup a mirror if you know how to :/
You already have forge.yunohost.org, basically the only thing you need to add is an rsync-daemon that gives read-only access to the mirror.
Then the mirrors can do the rest. I do run my own mirror (mirror.linux.pizza).
I can help you by guiding you if you want, I am in the yunohost support room on matrix (@jonathanselea:matrix.org)
A instance dedicated - but not limited - to people with an interest in the GNU+Linux ecosystem and/or general tech. Sysadmins to enthusiasts, creators to movielovers - Welcome!