One day kibble, one day raw, shouldn't cause any problems, aside from the dog possibly rejecting kibble. That's variable by dog, though. Mine doesn't care what you stick in her bowl. Some are picky. If that happens, in your situation, it might just be easiest to feed kibble exclusively.
It's mixing them in the same meal, or in feedings close together, that can cause gastro-issues.
Do you have a Costco near you? The new grain free food they're carrying is pretty decent. I like the ingredient list [it's a tad potato heavy], and it's super cheap.
I've never done slow switches with kibble, but that's because my dog tolerates switching foods well. You have to go by your own dogs. If they typically transition easier, then I wouldn't stress too much. If they seem to have stomach upset or soft stool, make a more gradual switch.
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: HCT, CGC