It's not quite as mad as it seems:
* I don't need a bilge pump because there's no bilge
At last, huzzah, the solution to sinking boats. Boats sink cos they get water in the bilges. Eliminate the bilge, problem solved.
Pardon the sarcasm but even without a bilge if you are leaving a boat unattended on a mooring you do need an emergency pump, bilge or no bilge.
Or am I missing something here ?
* I will be installing Nav Lights, but it'll be a while before I'll be navigating at night, so that's not an immediate priority, but it does need thinking about now for the future. For the small size of boat I just need a tricolour at the top of the mast.
It's a very small boat and I don't wish to be too excessive. There are currently no other electrical requirement at the moment other than the iPad. The log runs off of some AA batteries as do the interior LED lights.
Personally I think that anyone thinking of spending multiple days on board any boat needs lights. It doesn't take too much to go wrong for a day sail to end post twilight so it does make sense to be ready.
A small solar (with regulator, cos I agree with MaineSail) system if you do the hard work yourself is relatively cheap and you'll end up with decent nav lights and an emergency pump plus the ability to run a radio and keep that Ipod charged. Attack the problem holistically , piecemeal is never a terribly good idea.