Maybe Gesink still deserves a shout at getting in as well? I think this was the dilemma I had when trying to think of a squad for them you probably want one of Teunissen or Laporte (or even Van Hooydonck) to be able to handcuff at least Rog and Vingegaard to classics specialists. But that probably rules out taking Gesink, and with Martin retiring having both missing would be losing a lot of your experience in terms of 'road captains' (if that even means anything). Although that then means that Affini probably misses out so I think this may just become a headacheI'd go with
Last two spots would be between Dumoulin, Teunissen, Laporte and Affini.
Or maybe if Dumoulin finds back some of his climbing form, take him instead of Kruijswijk and go with two between Teunissen, Laporte and Affini.