NO!
I'm not one to really ever comment on threads like these but this one I can't hold back:
Personally, I don't know how you could ever do that to your other children. To even consider it after they have expressed how badly it would make them feel. It's not even like you have a 2 year old and then 3 kids, say, 14 years old and over! That's a different situation entirely.
Also.........For potty training???? Are you serious? Did all your kids get a Disney vacation for going potty???????????
She's 2 years old. She just went to Disney. She's going again next year. Believe me, she'll be just fine with that.
You have 4 children, not 1.
Sorry but I'm just keepin' it real.