"Forcing" magazine federation from other instances?

Going straight to the point: I was wondering what is the criteria for kbin to pick federated magazines (number of subscribers maybe?) and if there is a way or workaround to pull/force them into the "All magazines" list.

For example, I am interested in https://feddit.it/c/teoriamusicale, which would translate into kbin's URL https://kbin.social/m/teoriamusicale@feddit.it. It has been created weeks ago and probably it hasn't been picked because of lack of content. I would like to contribute to it without having to create a feddit account (I'm quite attached to my kbin one).

I'm sure many of us here had/have the same issue - how did you work around it?

EDIT: and now it's there!... Miracles (or @ernest's kind intervention) :)
Anyway I think my point still stands, I guess.