You can just make up words that are vaguely Hindi-sounding. It's likely that is what became of the Visha language as the empire crumbled and their tongue was bastardized. Input words like 'King' into Google translate, and then mix them up to make your own words. Or something. It doesn't have to be literally Hindi. I'd actually prefer it wasn't, since Hindi as a language in a fantasy world seems really out of place, even with the Hindu themes.