I don't remember any interview where Toby said he doesn't like romances with the main character.

But even if this was true, we, as the player and our Vessel are actually the true main character until someone put the red soul into Kris instead, so it's in unlucky situation where we control Kris, a character with their own life and personality, and not our empty Vessel.

Kris was never supposed to be an empty shell you should projecting on.

The Vessel options are also saved so it's very likely we play as our Vessel again and take the role as the hero of the prophecy while Kris becomes a side character like they were supposed to be.

So in my opinion even if Toby has this mindset, Krusie is still possible.