Aesir,
You're absolutely right about the R22 lighting. The Squirrel family of helicopters, both singles and twins, just have a 'light generator' and what looks like aluminium foil on the instrument panel cover to refelct the light.
Um.....
Interestingly, whilst I agree with your comments and sentiments about night flying in singles, I have 2 friends who have had engine failures in piston singles and walked away from them unharmed and with minimal aircraft damage! The few I've known of in twins have resulted in disaster. The key factor in the ones I've known of have been the nature of the terrain over which they were flying .
For myself, I like a headlight, and I normally just clip and LED torch to the side of my headset.