Simple question. Are the Neutral Input and Neutral Output permanently connected?
If so, does the Neutral Output actually need to be connected? Wouldn't the switched Live Output simply flow to the same Neutral?
Answering my own question, examining the back of the circuit board clearly shows that there's a permanent connection between the Neutral In and Neutral Out. I'd guess they're both included since the normal use of a Sonoff Basic is on a cord or flex, where you'd be breaking into both live and neutral connections.
But in my use case, I only need to supply a switched live output that (eventually) flows to the same Neutral as is provided on the input. So I don't think I need to connect the Neutral output at all.