How to change default ALT GR characters.

I have a PC running Windows 10. It has a British keyboard without a numpad. If I press ALT GR, above the ‘e’, ‘u’, ‘i’, ‘o’ and ‘a’ letters I get the characters:
é ú í ó á
I would like to change the accents to become “grave”, i.e.
è ù ì ò à
How can I program the registry to make this change?