How to Use Keyboard Shortcut ⌘; when ; doesn't exist as a single key?
On an English keyboard, it's the key to the right of L. Sometimes the position is mapped, rather than the actual character. Maybe worth a shot, though I can't test here. 

BTW, Adobe uses its own key-mapper - towards the bottom of the Edit Menu on Photoshop [I don't use Illustrator] - so you could check &amp;/or change it in there...