Generate « and » characters from keyboard I'm trying to make it so I can press ctrl + cmd + [ to create « and ctrl + cmd + ] to create ».

I tried searching google and couldn't find anything that would allow me to do this and all the tutorials seem to do things differently from what I'm trying to achieve.

I have tried https://pqrs.org/osx/karabiner/ but I can't figure out how to setup custom keypresses.
On UK English, those characters are available on   

 Opt ⌥   \    «
&amp;
 Opt ⌥   Shift ⇧    \   »

The Keyboard Viewer is useful for finding some of the obscure ones, available from the menu bar after setting System Prefs > Keyboard > Keyboard to show there.