It depends on what your doors are like as to how much they will open with the solenoid kit. I did this to my Mk1 Fiesta (very light doors) 10 years ago and it worked really well - looked good when operating in a car park!

I just wired it up to the wire in the alarm which normally operates the central locking, easy. This means you can do away with your door locks altogether as there will be no handles to get in. I never had any problems with the mot man but you could do what TVRs' have and put a button on the underside of the wing mirror if the MOT man is arsey.

Hope this gives you some food for thought.