I don't have a lotus yet ... but, I've seen a few threads and looked at some stuff and now i'm curious. The older lotus elise / exige uses an immobilizer alarm system. My 06 honda accord also uses this system. I wonder if the elise key guts could be placed in an accord key. It's not stunning, but it's not as bad as some of the alternatives, and a lot better than the dangly alarm dongle.
http://t3.gstatic.com/images?q=tbn:ANd9GcROLOxv8HFLI5J1NgsYQVp7VzjrHfOnhskDFkfxcT7gQYJKs2fV
http://t3.gstatic.com/images?q=tbn:ANd9GcROLOxv8HFLI5J1NgsYQVp7VzjrHfOnhskDFkfxcT7gQYJKs2fV