Don't worry Chris, I am laughing at this end. The day I take a thread seriously it'll be time to pack up. I think the Avensis idea is interesting. Not sure that you'll be able to get a cable run to it though. You may have to lose the back plate. But it's an idea. Converting the rear to disc handbrake from internal drum handbrake is something that clearly Toyota have done, so it's a maybe. The rear brake systems are identical in design on the two vehicles so anything that works on one can be made to work on the other. If you pursue a disc brake ad I pursue a prop brake, first one to make it work wins! And the other has to show his arse in Landrover magazine.
The ideas are certainly bouncing. That's for sure.
C