Although I live in the UK, due to circumstances beyond my control, I am now using a US keyboard, and have therefore set the keyboard layout to US in Windows 11.
I don't want to faff around with the shortcut of "ALT key and type the number 0163" to obtain the £ symbol. Instead I just want to use something like Right Alt + 4 to obtain it. Microsoft Powertoys allows you to remap keys. However, it doesn't seem to allow a £ symbol in the "Mapped to" section (unless one of the special VK "Virtual Key" codes might do the trick).
I've tried pretty much all the keyboard remapping tools
shown here, but unfortunately, none of them allow you to remap to a key outside the current keyboard character space. Since the £ symbol doesn't exist in the US keyboard layout, they therefore don't allow you to map to that character.