I think when I initially saw 'disable overlay hotkey' I didn't realise it might bring up the gui. I may have misinterpreted it as Disabling 'Overlay Hotkey' (so the hotkey doesn't work), rather than Disabling 'Overlay' hotkey (only disabling the overlay, bringing back the gui).
Perhaps you could have 'Disable overlay' as shown above, but with the 'Hotkey' text centred next to the custom button (shown as 'Delete' above). eg 'Hotkey (GUI): Delete'. Perhaps the Delete hotkey above (or Escape as it is by default) could resemble an actual keyboard key, but of course that might take up a lot of time and isn't necessary :)
I suppose the only minor issue is not being able to maximise from the taskbar straight after applying a filter, and instead having to use the hotkey, but I'm guessing due to the way the tool works with the screen, this may not be possible. Thanks for the help!