Hi I have just put in key less or central locking a long with an alarm system. Is was just shy of $400.00 all up. The guy who did it for me said it was a easy job for him and had on problem until i add a boot release to the Job.
NO go with out drilling new holes.
So it was a no after spending all that money on new paint work. It give a bit of peace of mind now that it has the above alarm as the car is my daily driver.
Bruce
Ps If you want some photo I am happy to put them up for you.