I think it is OK when it is a completely foreign and unusual name because people wouldn't already have an expectation of the way it's pronounced. Most people wouldn't know how Inari was pronounced so it wouldn't matter if you made it slightly different.
However I do think it's silly to change the pronounciation of a name which is already well established in a culture. Your example of
Sarah is very common in English-speaking countries and people would automatically pronounce it "sair-uh". So if you changed the pronounciation you'd have to correct people all the time. It would be much easier to just spell it
Sara.
Also it only makes sense to change the pronounciation a little bit, as you did with Inari. The emphasis is quite a small change so it isn't such a big problem.
I personally would just use the correct pronounciation because its easier than correcting people (if it's a common name) but I don't have a big problem with people changing the problem if it's only slightly.