Seriously, forks, that particular issue need not arise: if Vulcans have a writing system based on individual letters denoting individual sounds, then there is
gonna be an M-analogy that represents the first sound of "Minshara".
Whether Vulcans have that sort of a system is debatable. We see apparent lettering on the side of the Vulcan shuttle in ST:TMP and the transports in "Unification", and on the clothing of the Kolinahr Masters, but not elsewhere AFAIK; other instances of Vulcan writing tend to be examples of their ancient calligraphy, which appears fundamentally different and extremely unlikely to feature a specific individual symbol for the sound "m" or "mi". Did we ever get a good look at a Vulcan computer display?