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I assume the answer is no.

I am asking, because my IME (Mozc) converts おにょみ into 音読み (same with
くにょみ→訓読み).

I think this is simply a matter of convenience to save the user from having to
press `[n]` twice, but I can't think of any other word where this kind of
feature is implemented.

So is there anything more to this?
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2020-12-06T13:10:44.953
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spelling
Is おにょみ a valid spelling/pronunciation of 音読み?
おにょみ does not make sense except as deliberate 変換ミス (e.g. for comical effect).

Handling such mistypes is a common IME feature for words with ん+ vowel
combinations or ん+な行.

[![IME settings
screenshot](https://i.stack.imgur.com/vfM4W.png)](https://i.stack.imgur.com/vfM4W.png)

As shown in the screenshot, another common example is おんあ(onna)→女.
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Adding on to Igor's answer, which addresses the spelling aspect. Let's look at
the pronunciation.

> Is おにょみ a valid pronunciation of 音読み?

In a word, no.

  * おんよみ is pronounced something like [[õ̞.ɰ̃.jo̞.mi]] in normal speech. This has four distinct [morae](https://en.wikipedia.org/wiki/Mora_\(linguistics\)) ("beats", the timed length of sounds in Japanese). The ん between two vowels causes nasalization, marked by the tilde ~, with the specific mora of the ん often realized as something like a tight //u// sound with nasalization: technically, [[ɰ̃]], a nasalized [voiced velar approximant](https://en.wikipedia.org/wiki/Voiced_velar_approximant).

  * Meanwhile, おにょみ would be pronounced as something more like [[o̞.ɲ̟ʲo̞.mi]]. This has only three distinct morae, and no nasalization.

音読み is only ever spelled in kana as おんよみ, with four kana corresponding to the
four morae, and with ん correctly indicating the nasal consonant.
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