RK plays with one "wing forward" and one presence up front. I can surely see one of Perez or Sandro here next season. But yes, it will be really interesting to see who the presence player would be when Rom goes.
I personally can see us deploying a 3-4-3 at times, the 2 players you mentioned would certainly have a role to play, but neither are a "Lukaku replacement" in my eyes.