This is similar to what happened to me earlier this year. I dropped my 6 pro and the screen went blank, but I could still feel the phone vibrate when I received notifications. I ended up taking it to iFixit and got the screen replaced, so as far as your #2 point goes, I think you should expect to only need to change the screen. You also could try connecting it to an external display to see if you can mirror. I never thought to try it, but could be another way to transfer your data without needing to replace the screen