Not a perfect solution, but if you’re just looking to rebind certain system level commands, you can do that in Settings > Keyboards and at the bottom there’s a heading “Keyboard Shortcuts” with a button “View and Customize Shortcuts” where you can change the keybindings of system commands to use CTRL instead of FN.
Not a perfect solution, but if you’re just looking to rebind certain system level commands, you can do that in Settings > Keyboards and at the bottom there’s a heading “Keyboard Shortcuts” with a button “View and Customize Shortcuts” where you can change the keybindings of system commands to use CTRL instead of FN.