With 41 votes of 71 people in so far we have option 3B (12 Hour, 24 Hour Hand, No Date Function 2426) as the undeniable winner, the same as my initial proposal. 28 people voted this as their first choice, 5 as their second choice, 1 as their third choice, and 2 had voted for the dated option 3A instead.
I was very interested to see how option 7 with a day/night indicator would turn out, and it did place second. I am a bit disappointed it was not realized in time for the Neptune project proposal, but I would definitely keep that in mind for the future.
Option 5, the subdial variant with 24 hour hand, placed third.