Issue with British Late 2015 Retina Macbook Pro + Monterey and Keyboard layout.

That note didn't fix it. Attempting to run the tool from the command line returns the following:

No other windows spawn, and i'm not prompted to press any keys.

Attempting to run the wizard from the normal system preferences window results in a dead end too as the button for "change keyboard type" doesn't appear within the dialog.

Not quite sure how I am meant to capture the problem in a screenshot though, I can try explaining it again but have included a screenshot of my keyboard layout dialog if that helps?

I have a UK mac book pro, it has a UK (ISO) keyboard. The keyboard layout available is "GB" which I assume is the correct one, but selecting a US, ABC or any of the extended types doesn't change the outcome of an inoperable ~ or § key.

The problem is, an external keyboard will use a map suited for the external keyboard and will work. I can type tildes using an external keyboard, just it's a laptop and I'd like to use it portable if possible.

Not saying it's not hardware related but it does seem like an odd hardware fail for two keys to fail, only two keys and every other key works. If it was physical damage then it's odd as they're not next to each other, there is no visible damage I can see and then there's the whole thing of how it worked when the mac ran big sur, but not now i've upgraded to monterey.

I might try downgrading to Big Sur if I can.

Plus, there's no explanation for the missing button for the keyboard setup assistant in the GUI or the lack of GUI spawning when I call the tool manually as per your excellent note.

There is no .plist at /system/library/com.apple.keyboardassistant.plist either.

It's just really odd. I've found that alt + n followed by a space types a tilde and alt + 6 types the weird § character so it's workable, just incredibly annoying. Thank you for trying to help as much as you have. I will report back if a reinstall of OS or a downgrade changes anything.

Correct, nothing at all.