Can hiragana & katakana "spell" the sounds of all Japonic, etc. topolects?


Japan has a lot of topolects. Most of them are all classified under Japonic.
These include Ryukyuan, Hachijō, Kyūshū and obviously eastern and western
Japanese.

Can hiragana & katakana "spell" the sounds of all Japonic, etc. topolects?

Are there sounds and pronunciations outside of general hiragana & katakana
abilities?




At least Okinawan has nonstandard kana to precisely represent their sounds.
For example, Okinawan has two types of う ([u] and [ʔu]), whose difference is
important for the local people to distinguish their native words.

  * [Does Okinawan have syllables Japanese doesn't?](https://japanese.stackexchange.com/q/43775/5010)
  * [Okinawan scripts](https://en.wikipedia.org/wiki/Okinawan_scripts)

Ainu also has [special
katakana](https://en.wikipedia.org/wiki/Ainu_language#Special_katakana_for_the_Ainu_language),
although Ainu may not be Japonic.

There is always a way to approximate their words only using standard kana,
anyway.

To the best of my knowledge, in dialects in Honshu/Shikoku/Kyushu, no special
kana is used. Of course there are regional varieties only describable with IPA
(e.g., [う is nearer to [u] than to [ɯ] in Kansai
dialect](https://en.wikipedia.org/wiki/Kansai_dialect#Phonology)) or
allophones found only in some dialects (e.g.,
[yotsugana](https://en.wikipedia.org/wiki/Yotsugana) and
[bidakuon](https://en.wikipedia.org/wiki/Dakuten_and_handakuten#Phonetic_shifts)),
but they are not distinguishing features. (Bidakuon have special characters,
but they are more like phonetic symbols to me.)

