I use one of these covers when parked overnight away from home. So far there has been no tampering with the cover.

http://www.morganhoods.com/id67.html

It must be possible to fit a Bonnet Release Alarm under each of the the bonnets if you do not want to change the Traditional Appearance.

Enjoy the Mog. cheers

http://franks4x4-solograndetour.blogspot.co.uk/
Combat Stress-http://www.justgiving.com/Roadster100