I think you've nailed it, plus I would add (in comparison to a cx bike) some mounting points for luggage and bottles, lower bb and more relaxed head tube angle.Ok after long and careful consideration,
I put this to the vote:
650, 70026
Bars: Drops flats risers
Forks: Rigidsuspension
Brakes: disk caliper canti
Tyre: >35mm+ <32mm
Single double triple
Cassette:>36t <32t
I think you're allowed one eception
More than that and you're pushing it.