Too bad you're across the country...
I picked up a girl that is supposedly carrying the satin gene and still am kinda squinting at her alot.
She's a gorgeous Lesser Black Pastel (Satin?) but her pattern makes me wonder. not much blush on her head though
https://imgur.com/a/RkeUDYr
EDIT:
I just realized that you can make out more pattern and a bit of grey on the 'white' one in the photo of it's sibling. It totally looks like a champagne pattern there. I'd try taking a blacklight to it and see what you can make out. So maybe you did hit on a multi-gene pastel Champagne