I've never seen anything like that .It looks to be a pain in the buttocks .On occasion I use an Oregon style guide just to keep the angles in check .I also take a bare file and open the gullets down to the tie strap .It doesn't make the chain get more bite but the gullet holds a bigger chip ...
I think with hand filing the choice of a file makes a lot of difference .Oregon is rather soft and aggressive and doesn't work well on Stihl chain .A better choice would be Pferd or Save edge .
Those little hand grinders with a round stone are okay for a rocked chain not so good other than that...
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