To offer some help for 2 and 4, you can get a script out of a notebook with jupyter nbconvert <notebook.ipynb> --to python, which you can even include as a cell

To offer some help for 2 and 4, you can get a script out of a notebook with jupyter nbconvert <notebook.ipynb> --to python, which you can even include as a cell that starts with ! since that will run shell commands. For part of 3, there is global search and replace accessible either via Edit -> Find and Replace or Esc-F, and it includes case sensitivity toggles, regex search, and the option to change the current cell or globally. For 1, I think there are some plugins that can make that tidier, but I've generally just accepted that if the people I'm presenting to don't want to see code then I'll just need to make a set of slides out of the whole thing.