Switching from QWERTY to Colemak on my phone was effortless, just installed it and started using it easily. Using QWERTY on my bf’s phone feels awkward now, even though I use it every day with my computer keyboard. They definitely seem to occupy different mental spaces.

FlorisBoard has Colemak and swiping with predictions.

I believe Reddthat federates with everything.

Failing the captcha doesn’t mean you lose your user name. I failed a few times. There’s a button you can click to generate a new captcha so you can try again.