I can't understand why the enzymes in bio powder would destroy the proteins in feliway as each enzyme is specific to a certain molecule. I would guess it is more likely the bleaching agents that are denaturing it - therefore if you use a bio powder for coloured fabrics or a bio liquid, (they don't contain bleach) it should be OK.
When I bought the last lot of urine remover from xeria, I spoke to the owner. He told me that their urine remover contained a mix of enzymes which includes ones that would "eat" the proteins in cat, dog, mouse and rat urine, as well as blood and some other stuff.