I just did the exact same areas on my rebuild all around the bonnet catches and now primed. I found a paint supplier - Classic Car Paint supplies 01516522302 who from a 2" sample matched my "Red" paint colour and supplied a 400ml aerosol for £7.95 - perfect match - they also supply cellulose paint.
My electric wiring looks in same state as yours. Have found www.cbsonline.co.uk . See page 64 for a prewired module 12 fuses, relays, indicator flashes etc. all prewired. Looks interesting solution.





Good luck!