We have developed a solution for retro fitting our product into the Kristil system as several home owners had no idea what to do with trying to get replacement components etc. We have overseen a handful of jobs replacing the Triac dimmers with our dimmers and using our wireless input sensors at the switches to control these.
I'm not 100% familiar with the security panel myself but should be able to help in some way. As a minimum, I would expect that you would need an installer code and access to the service/programming component of the system (likely to be in the keypad)
Send me a PM and I'll arrange for someone to come to see you. If you are outside Auckland I can guide one of the dealers through what we have learnt so far!