I am greatly sorry for the loss of your loved one. Losing a family member can be very tough. Monday morning my chinchilla, which we've had for 8 years passed away, and I was greatly saddened by the loss of my little munchkin Chilly. He was a great pet. I can only imagine the loss you and your family are going through right now. I can't even put into words how sorry I am. I think the etching might be the best option, as I don't know if those blocks in the entranceway to Magic Kingdom are still available, but I wish you and your family the best possible trip under the circumstances, and am greatly saddened to hear about your loss. When my pet died, I found writing about him to be a good way to vent my emotions as well as make a tribute to him so I'd always remember the little guy. I think that your idea though is a very special and GREAT idea.....as he'd always be in a place where millions are happy. I hope you are able to find what you are looking for, and in no way was trying to equate the loss you felt, to mine...I just thought it might be of some use. If you have any questions or needs, feel free to pm me if I can help.
{Huggles} and pixie dust.