What you all haven't realized is that the PRK has a pretty varied population, and this can work to their benefit now. Both Tinites and elves. The obvious answer is to send some elves on what amounts to a suicide mission in Tin's island. Give them mitril weaponry and Tin will have no reason to not jump to the conclusion that they were elven assassins/scouts/whatever sent from the narby Yllendthyr bases.

Similarly, send Tinites to the elven islands. Because Tinites look kind of like other humans, give them KalMean guns like Tinites might use, and maybe even Dragon pendants or the iconic facemasks of the Temple Guard.

That would sow a lot more chaos and be far more likely to lead to a war, if that is what we want to do. Of course, the elves and the Tinites must be caught, but they must also be quickly killed so that they can't be tortured to discern their actual nationality and motives.