Letting user customize the "key" for Onkey

Hello,
I want to let my user to customize which key to trigger my Onkey function.

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the worksheet("KeyBindings") looks like this
20210311161549.png



Problem is, I don't expect my user to know how to enter the keys that .Onkey understands (for example, {PGDN}), so I need to have something to get which key the user pressed (and convert into the string that .Onkey understands, if necessary).
The best method I found on the Internet is KeyPress Event, and I am not sure if there is a good way to convert Ascii from KeyPress to string for Onkey.
Or are there any better ways?

Thank you very much.

Thank you so much.

And I just realized Onkey can understand "{Keycode}" from KeyDown

I just realized that the user will not understand the Integer from Keycode. As shown in the image of my original post, the user should know which key the function is bind to.

Is there a simple way to convert Keycode Integer to something the user can easily understand? Do I have to put a function to translate every integer?

Many thanks.