A Suzuki satellite team with Zarco would be welcome on the grid, imho. I suspect the good cornering Suzuki would be more to his liking, and more similar to the Yamaha than a KTM, Honda, or Ducati would be.
Of course, there will be contract considerations, will KTM release him to ride with another team, or will he set out 2020? I don’t see the advantage to either of them to get a Moto2 KTM ride for Zarco.