myn also stops the confusion between mine, mine and mine but definitely means mine albeit spelt more fun

I think words should be spelled phonemically. Differences in spoken regional dialects could be handled by specifying a national standard dialect and spelling as that dialect is pronounced. The spelling of homonyms differently is just too confusing. Spell them all the same. If there is any chance of ambiguity (not resolvable by context) the pronunciation or word itself will change over time.

Ceci n'est pas un seing.