I did what you did a few years back. I bought my (1st) Ergodox-EZ and I switched to Colemak and the new keyboard at the same time. I practiced heavily using keybr.com and thetypingcat.com for about 2 weeks, then had to force myself to stop using QWERTY altogether. I just used my EZ for all my typing. This forced me to build up new muscle memory fairly quickly. Once I stopped using QWERTY, my Colemak got alot... Source: about 2 years ago

I've tried all kinds of portable physical keyboards but for programming on android you can't beat Hackers Keyboard https://github.com/klausw/hackerskeyboard I've got a fork working with Android 14. - Source: Hacker News / 5 months ago

I forked the Hacker's Keyboard app on GitHub tweaked it, and compiled it. (using Android Studio). Source: about 1 year ago

Does not work with Hacker's Keyboard (https://github.com/klausw/hackerskeyboard). It closes itself after a few deciseconds, whereas usually the permanent notification feature can be tapped to open and use a keyboard anywhere. Or maybe I haven't tried using it on the new Android 11 yet and yet another of my favorite hacks broke.... Now that I try it elsewhere,... - Source: Hacker News / over 1 year ago

I used to code NodeJS services on my phone quite a lot when I was commuting to an office. I used Termux - https://termux.dev/en/. It was brilliant, and worked far better than you'd think it would. The main problem was the keyboard because the stock Android one doesn't support a lot of symbols. I solved that with https://github.com/klausw/hackerskeyboard. - Source: Hacker News / almost 2 years ago

When I had it installed a couple of years ago, I found hackers keyboard very useful. It has NOT been updated in a long time. So proceed with caution I guess. Github link. Source: over 2 years ago