"Shortcut for Text Replacement" - r/Shortcuts

Does anyone know how to create a shortcut for text replacement on the iPhone? Or any settings for that matter.

If you mean a shortcut to simply navigate to the Text Replacements menu, here ya go!

Here's the scheme it uses: prefs:root=General&path=Keyboard/USER_DICTIONARY

Funny enough, for the first time in iOS history, we now have an up-to-the-minute public reference for all available settings URLs , maintained by our very own FifiTheBulldog!

If you were actually talking about manipulation/integration with the user dictionary function, Antonio Bueno's recent work is as close as it gets, I think.