I have a personal fork of hyprvoice[0] which I use almost everywhere now (w/ the big cohere-transcribe running on a local vLLM instance). It does a similar thing, but that's not why I'm mentioning it; I think it's worth looking at because it's a clean reference for the few elegant ways you can implement text injection in modern Linux (wayland).

It supports ydotool[1], wtype[2] and "clipboard fallback with clipboard restore". The first two you can probably think of as AHK equivalents - they wire in at the input layer and inject keystrokes when injecting text. wtype is wayland-only and a bit less invasive, ydotool supports non-wayland also apparently, but I haven't tried it. Neither approach provides 'instant text' - you have to watch the text get typed out, and you don't touch your keyboard while it's happening; the clipboard implementation is fallback for a reason as it's the least reliable. The first two work 'well enough' though, and are fairly tunable.

The other thing hyprvoice does in probably the most linux-friendly and universal way is the 'hotkey handling'. The server creates a socket in /tmp that the cli can then ping when the user triggers the start/stop/cancel, and they do this by binding whatever their DE's keyboard shortcut mapping mechanism is to trigger `hyprvoice toggle` as a background shell command. This works extremely well and is much cheaper than you'd intuitively think coming from Windows. This way you don't have to interface with DE-specific global keyboard listeners etc, but leave that to the WM (that's not to say that your installer couldn't prompt the user to configure the keyboard shortcut for them with their detected WM, you just wouldn't do it in the software itself).

I haven't actually looked at your project in too much depth yet as I have a solution for this already, so apologies if none of the above is news to you. Hope it helps though - happy to poke around and contribute something if the gap's still there.

[0]: https://github.com/leonardotrapani/hyprvoice [1]: https://github.com/ReimuNotMoe/ydotool [2]: https://github.com/atx/wtype