A couple of points in the discussion about lighting and dynamo hubs:
No dynamo hub that I am aware of is easily serviced if / when the bearings go but your average high quality front hub these days has 6001 2RS or similar cartridge bearings that could be replaced at the side of the road. A box of SKF bearings in the fettling kit would allow most competent home mechanics to swap over a set of bearings whilst Steve eats, sleeps, or even stops for a fuel break if such things can be coordinated.
The light output is totally restricted by what is currently available on the market. Lots of battery lights pump out far more light that the best dynamo offerings at similar or lower cost.
Over the entire year the vast majority of Steve's riding will be in daylight rather than darkness. I guess that there will be a period of time where Steve will not even carry lights, or just a couple of small 'be seen' lights because he's not scheduled to ride into dusk and darkness.
Overall I reckon he's got the kit right for this particular challenge.