New answers tagged pinyin
You can find pinyin for 唔 typed as ḿ and m̀ at en.wiktionary.org and I'm sure they have other examples. I did not look into how they did it -- is it correct for your purposes? I know nothing about Unicode. I suppose if you wanted a LaTeX solution that would be easy.
Tones are only applied to wovels. There are no tones associated with consonant "m", so you have to assume a prefix wovel like "e" before the "m". Unicode-wise, you can get an accented ḿ but no other variants. Yes, you see accented "m" in dictionaries, but they are outside pinyin, and also outside unicode.
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