I have both Light Sussex and Chocolate Silver Laced Orpingtons and both fit your criteria. They are quiet, dignified, friendly, very good layers, and are pretty to look at.
I was horrified for you! 😱 I was a little stressed reading that thread and I couldn’t get to the end fast enough to see if the resolution was “right”. 😂😂😂
In reading various sources about creating green & olive colored egg layers I have noted that the WTB’s are mentioned far less frequently in comparison to the CCL. Am I right or is my perception skewed? And if I’m right, why? The WTB doesn’t seem as popular to own simply as a blue egg producer...