I was thinking seems like a red chicken would need to be the starting point. Makes since red would be closest to pink.
I also think the lavender gene would be the smartest dilute gene to think about.
From there it'd be a matter of any other genes to get closer.
There's mahogany to darken then the dilute gene used to turn red to buff. Legbars creme gene, etc.
It'd be mix and match and see the outcome. I really haven't put much thought into it because I have no interest in a pink chicken and if they're thinking a true pink color I don't think it's possible.