I think that what you are looking for already existed in IFR and it was called Multireddit, it seems to me that the Eternity dev mentioned in a comment that he wanted to implement multireddit as multicommunities in the future
Yeah, I want to implement this as a feature. As far as I know, the Lemmy API, does not have this feature (yet), but it's not impossible to overcome this.
Yeah something equivalent to multireddit but for Lemmy would be roughly equivalent to what I am thinking.
Summit does it IIRC, so it should be possible
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