Thank you, that works really well! I have some feedback, apologies if you're not taking any.
Hotkeys for poses don't seem to work when the app is minimised.
It would be cool to have a hotkey to start/stop tracking.
Colour-coding the markers for the bones would help differentiate them when clicking.
Sometimes the little window for naming new presets gets stuck and doesn't close when I press apply, especially when I've previously deleted a preset.
With my keyboard layout I use combinations of FN and FN2 keys to access certain keys, such as the F13-F24 range. The app doesn't recognise the hotkey combos that use the FN2 key.