Another random suggestion, I recently got a PC keyboard that can pair to multiple Bluetooth devices.

Now that I can hit a button and switch to my phone, I no longer hate SMS quite so much

I also 3d printed a phone stand for my desk, which it turns out makes typing on it a lot nicer too

They are not requesting for info on running their own SMTP service that interacts with the greater internet.

Though even if they were, the difficulty is overstated. I’ve run my own for years.