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As far as a 'plugin' - I'm not sure of any out there that check 'passively.'
But, a few months ago I made a profile just for my characters to farm the Shado-Pan reputation by farming the tokens the 'Warscouts' and 'Warbringers' drop around Dread Wastes.
The profile could easily be changed to farm Krol. Just need his ID and XYZ location.
The profile was created specifically for Hunters as it engages by shooting Arcane Shot at the target via 'InteractWith.'
So you'd need to change the opening attack spell with something that fits the character class/spec you're farming with. If you don't know how to do this - or get his ID/XYZ, I could do it for you.
But here is the original profile I had wrote which runs on the questing botbase that you could use as example.
This 'method' can easily be used to farm almost any rare out there and it's also flexible enough to farm multiple rares or herbs/ores at the same time just by adding more IDs.
If needed as well, <HuntingGrounds> could be added so that the 'InteractWith' searches for the rare in a larger location with various XYZ locations.