I'm actually loving this idea. Mainly because when DD3 (6.5yo) heard about it she asked why it was needed when Santa normally finds his way around just fine. She's at that point now where she's starting to disbelieve in Santa.
DH, without thinking, said it was because Rudolph would have a mask on this year so it would be more difficult. About an hour later she asked DH why Raven, our cat, didn't have a mask on and DH told her cats were exempt. She asked why and he said because cat ears make it too difficult to put a mask on as they are soft.
This was about 4/5 days ago and hearing DD pipe up "Daddy, what about X animal. Do they have to wear a mask?" about 25 times a day has been the highlight of my year because the "Why the fuck did I even say that?" look in DH's eyes is hilarious 
T