Sorry, I confused you. You need .2 grams KBr per liter of the working developer. The directions I gave you were for mixing a 2% stock solution (2 grams/100ml water). KBr will dissolve in PG, but requires a higher temperature - around 200F in my experience.
I prefer to add the KBr to the working developer solution.
With regard to the metabisulfite, I have mixed Pyrocat both ways, and with the films I am using have seen no differences in developer activity or stain levels (blue channel densitometry). I agree that it is more conservative to leave it in the formula.