Hi
I have a LaserLine alarm on my 172 which incorporates the Renault immobiliser into the system, so the whole package is brought upto Thatcham Approved cat 1.... All insurance approved.
With regards to your insurance company I would re check about the alarm, as they are probably guessing that the car is UK standard which ofcourse comes with the alarm / immob, where as Euro imports come with just the immob....I had to have an alarm fitted on mine to obtain the insurance.
No false alarms, and ofcourse very easy to use.
Regards
JUNGLE