Sounds like a great journey!
I am off tomorrow for my first NZ RE Rally. It is being held in the South Island and I am at the top of the North Island. I have allowed 2 weeks, approx 3200 klm. I think I will be attending from the furthest away. Might mean a free beer!
What I have done this week is a full service, oil, filters, plug, chain etc.
The parts I will be carrying are 3 cables (clutch, brake, throttle), 1 hand lever,1 oil filter, plug, tire tube, repair kit, 2 lt oil, electrical tape, tool kit and a few cleaning bits and pieces. I am one of those guys that clean my bike when travelling. Sort of a reward for getting me there plus it gives me a good chance to go over things.
The neat thing about using your Enfield on a longish trip is that it makes it a real adventure. It will be great to see a travel repot of your trip.