I have used (and still use) pretty much this same mouseless setup on both my main dev machines; I love it.

I just wanted to mention that a few years ago I swapped over to dwm from i3. If you haven't tried dwm before (it seems relatively little-known these days), then it might be worth spending an afternoon trying it out to see whether it suits your workflow as well as it does mine!

It's a lot more opinionated than i3, but if its opinions happen to match yours then it requires even fewer keypresses to zip windows around!