This old chestnut. Well the easy way would be to make your own relay system with a switch but OFC it won't be OEM...
I made a thread about upgrading my 'S' (even more spartan than yours!) and concerntrating on some front fogs. From what I can tell it's not certain if anyone knows if the wiring is present on these. Since i'm selling mine shortly I never looked into it further. Still, it should give you some insight and ideas on what to do if you want to take it further. Keep us posted if you do try and fit some though!