It doesn't even need to be physical - You should definitely give Type Nine a try ( https://typenineapp.com ) - (disclaimer - I'm the author). There are some promo codes below so you can try it out: I've used this since 2014 when I made the first version, and I have yet to meet anyone typing faster with the stock iPhone qwerty keyboard. 7AMYNPKN63KY. - Source: Hacker News / 5 months ago

I wanted to give swift a try when it came out in 2014. I created the keyboard I know you all miss on the iPhone, and it's been doing quite great since. https://typenineapp.com. - Source: Hacker News / over 1 year ago

The iPhone keyboard was definitely better than any other full qwerty smartphone keyboard of its time back then, but it felt so wrong to throw out the Baby with the Bath water. A whole generation had learned the T9 solution (not talking about the older multi tap). More people than ever had actually switched to something else than qwerty, and loved it. I think there is still plenty of great solutions to discover -... - Source: Hacker News / over 1 year ago

I've been using TaskPaper for a year now, and it is great for list-making and is all in plain text. As a side-tangent, TaskPaper may look simple and like another note-taking-to-do-list app, but it really is intuitive and amazing, especially when it comes to its powerful shortcuts and the ability to seamlessly move around lines of text. Source: about 1 year ago