xmk VS evsieve

You could try to use https://github.com/manna-harbour/xmk from the same developer in order to run Miryoku on every keyboard.

I have a software solution for that, but it's Linux only, and also you'd have to use KMonad or 𝑥MK for the keymap.

https://github.com/manna-harbour/xmk might be able to support dynamic options.

Sounds like a nice project! Also consider using the record mode of 𝑥MK for this.

It works in a VM on Windows, with usbip for communication. See https://github.com/manna-harbour/xmk/discussions/4. That might also be possible on macOS, see this comment.

Same with evsieve: I can see the keys I press, like in wev, but the remap doesn't work for the keyboard or the mouse:

My best suggestion for you is to leverage evsieve: https://github.com/KarsMulder/evsieve

There are many other software tools such as https://github.com/jtroo/kanata and https://github.com/KarsMulder/evsieve. The main difference with 𝑥MK is that you can use native QMK and ZMK.

Ironically I know you can do this in i3 and xorg/gnome using xmodmap or editing the xkb file. I'm pretty sure wayland compositors should be able to read xkb-compliant files but the recommended way of loading that in is probabaly different between various compositors? You could also use a "second generation" interception tool that works at the event device level.

You might want to try evsieve, it even has an example about toggling devices and it concludes with a hint on how to get this to work for 2 VMs.

Evsieve is amazing in general you sould check it out 🙂

evsieve has solved that for me, as the virtual device created is always available; it starts when I log on my computer and stay open forever.

evsieve can remap. I haven't used it yet but you can find it here: https://github.com/KarsMulder/evsieve

If this feels a bit limited (you have a few predefined options), there's also evsieve. Which allows you to do a lot more (like selective key pass-through, shortcuts, etc.).