For my iPhone I made a dumb script using the Shortcuts app. It's a horrendous app that combines all the worst parts of a scripting language with all the worst parts of a visual language. But I'm not sure how else to do it besides learning swift (I'm not confident I made the right decision btw. It is that bad)

So I just press a button from my quick select and then it'll send my text followed by a carriage return (depending on which option I use).

On Android I did something very similar using termux but it only took 2 minutes to write and is much easier to understand and use