Hi Toby,
It's worth keeping an eye on ebay for any bits and pieces you need. I know that a couple of complete wiring looms have been sold on there in the last few weeks.
Otherwise if you're not too bothered about having the lights working on the pod then you should really consider Karls suggestion of just using the relay. This is about as cheap and simple as it can get and you'll still have a working C5.
All the relay does is allow the little tiny power switch on the handlebars to be able to switch the big electrical currents that the motor needs. Another way of saying that it's a little switch that switches a big switch.
Ok I'm rubbish at explaining things.
C.