ok, thanks! I will wait, I was just testing it, I daily use LibreELEC and I read devs are trying to implement chromium and windevine in testbuilds.
If you're interested in testing some more, you can use a fresh installation of the latest Raspbian with PIXEL and the instructions should work.
Yes, that's what I did. Burn latest Raspbian with Pixel in a SD and try to make it work following your steps. I get libs in theis place but no windevine plugin showed in chrome://plugins and netflix idint work.
Then I burn the image again, use deb file and I get libs and netflix-launcher shortcut but no windevine plugin and netflix didn't work.