I think this calls for a feature where appointing moderators is something that should be confirmed or rejected on the receiving account.
Is there an issue for this kind of thing already open? I wasn't able to find one
there isn't karma as such, but up/downvotes are readily available and from that you can trivially get a total to display.
In theory there's even nothing preventing you from using a fancier algorithm to calculate something like reddit's karma, but then that wouldn't agree with what most clients display.