Hey, I just created an account to reply to this, so I hope you are still around!
I am super interested in your custom 10 image. I am trying to make the switch to Linux (and have for the most part) but just set up a Windows 10 virtualbox as a necessity for some work things. I do not like Windows 10 though and definitely like the screenshot you have attached. Is there any way possible that you would be able to strip out what makes it unshareable so that I could give it a shot?
Figured it was worth a shot to reach out - definitely jealous at your ability to do this stuff!