I have kbin.run loaded with a feature branch that enables post reports being sent to moderators of remote instances: https://github.com/MbinOrg/mbin/pull/249. There are a few technical issues that need to be worked out, but the basic functionality seems to be working.
Also, for those unaware, you should see that Mbin now enumerates all remote moderators for each remote magazine (scroll down to the “Moderators” panel on the right-hand side of the magazine); something we added in https://github.com/MbinOrg/mbin/releases/tag/v1.2.0. Instance to instance DMs do NOT work in Mbin (or kbin for that matter), but that is also in the pipeline to get implemented.
A big thank you to @BentiGorlich@gehirneimer.de for getting these critical moderator features integrated into Mbin.