I wouldnt trade Schneider at this point for any realistically available player, but Kakko or Chytil (id hold FC because we have literally nothing at C behind him) could be available in the right trade. I know people have an emotional connection to Kakko but if the Rangers arent bringing back Strome/Copp, and the team plans on being a Cup Contender next year (rightfully so) he's a trade chip. Lundkvist too, he will never have a spot on the right side here. Kravtsov & Othmann could also be available. Teams may also value Cuylle or Berard fairly highly based on their development.
I'm certainly not saying to trade all these guys, but they dont all have a future here, and something has to give eventually.