Enhancements to Hinglish Keyboard to Support ISO 15919 Standards

I know this is not exactly a question, but I wanted to share this feedback I submitted to Apple (shorter version) and hopefully start a discussion around this. Perhaps someone knows how to get around these limitations?

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Enhancements to Hinglish Keyboard to Support ISO 15919 Standards

Dear Apple, and Team which works on the iOS Keyboard,

First of all, thank you very much for supporting Hinglish as a language on iOS!! I am sure it is very much appreciated by Indian iOS community and many other users who want to write Indian Languages in Roman Script.

Google does offer a Hinglish keyboard but they only support English to Indic language transliteration. SwiftKey does a great job at supporting Hinglish, but they support the casual Romanization of Languages like Hindi, Marathi, Sanskrit not IAST or ISO 15919 standards. So, I really appreciate Apple supporting HINGLISH Romanization with the correct diacritics.

Current Scenario:

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The HINGLISH keyboard on iOS currently seems to support almost 95% of characters/diacritics required for Romanization of Indic languages (I can speak for the romanization of Devanagari script used for Hindi, Marathi, and Sanskrit language, not sure about other Indic languages) However, there are a few missing characters which make it difficult to use.

Examples of missing characters include ṁ or ṃ or ḷ or r̥̄ or ḥ etc.

Good to have Scenario:

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While I love the fact that Apple has a Hinglish keyboard which supports most characters for Romanization of Indic Scripts, as a recent regular user of the Hinglish keyboard, the missing characters do make the usability a bit crippled. There are sentences/words one cannot type completely because of the few missing characters. I think you are almost there, only a few gaps need to be covered.

I would appreciate if you consider adding the missing characters in the earliest possible build. It would absolutely increase the usage of the already great Hinglish Keyboard.

Thank You,

Ojus Narawane

Please refer to -

https://en.wikipedia.org/wiki/ISO_15919 (Complete list of characters/diacritics for Devanagari Script, that is used for Hindi and Marathi and Sanskrit)

https://play.google.com/store/apps/details?id=klye.plugin.hi1&hl=en (Example of an app that seems to support typing in correct Hinglish ISO Standards)