Thank you so much for addressing here how the x-card has been abused x.x I have my own horror stories with it.
Palette seems like an interesting option vs Lines and Veils. I'm a huge fan of LaV, but the tables I've been at turn the lists directly to the GM so no one else needs to know, so we can be open and honest without feeling any embarrassment. I thought that practice was the norm, and I'm surprised it isn't for the very reason you prefer Palette.