I love vim. I am not one of those users who has a huge number of plugins and takes part in an extended eco-system that they perhaps do not fully understand -- for the last ~20 years of my life I have been trying to learn a little more vim each time I use it. I often don't, but it just has so many surprises that when I feel frustrated, I try to work out the "vimmish" way of doing things. Occasionally I give into tempt…
Am a similarly profiled (neo)vim user .. but without cat. Sometimes I catch strange letter combinations like "gqip" in my emails that baffle the recipients. Want vim keys everywhere!
A friend of mine I met through my own similar (free) library is developing this like a madman: https://kindavim.app
It costs $3/month (coffee) but for a Vim person like me I gladly pay. Making this work across macOS is a total mess and a full-time job, and it's not trivial work.
If you want a free version, I have https://github.com/dbalatero/VimMode.spoon as a Hammerspoon plugin that works pretty OK, but I'm not actively developing it and prefer the kindaVim app at this point.