The cheat is to first see if the printed score will OCR correctly using Musescore’s website and tweak that result. I have had mixed results, hence the comment. My luck may have been better than yours, so far. It always requires correction, though and so far only processed solo parts, not full keyboard.
Nice tip on note entry. My wife has a digital piano that can export MIDI, but I am so worhless on keyboard, I suspect I would not get much bang for the buck.