If George and Charlotte do the walk, I doubt it has anything to do with Andrew. I don't think William would use his kids to take the focus off of Andrew, and yes, I believe they have used their kids for PR purposes, frankly, all the royal families do, but to save Andrew's behind? Nope, don't see Wills doing it. The kids have been more visible this year, so I wouldn't be surprised that this was always the plan (if we even believe that the report is correct).
I also don't see Andrew doing the walk. Maybe riding in the car with his mother, but not the walk, especially if protesters turn up. Queenie isn't going to let her precious son be heckled or exposed to protesters. She will protect him at all costs.
While I would love to see the kids, I would be worried about what they will be exposed to. If there are protesters, it could be scary for the little ones. I know that protesters will probably be kept away from them, but a lot of people yelling at them would be very confusing and young children do not need to be exposed to that. This is why I believe, if the queen has any brains, she would tell Andrew, and his daughters, to stay home. Now, I don't believe in punishing the girls for the sins of their father, but, if this is to be George and Charlotte's first Christmas walk, then let the spotlight be on them. The girls can stay at Sandringham and keep their dad company.