I took my 2 year old to Chef Mickey's breakfast by myself in August 2006. She didn't listen either!
I was lucky that my table was right next to the buffet. I left her at the table 5 feet away and grabbed a plate with some fruit. Within 20 seconds, I was back at the table and had her nibbling on fruit.
Then, I went back for another plate and kept looking behind me every 5 seconds to make sure she was still seated. I didn't venture any further than the warming table that was right next to our table. I put a scoop of eggs on my plate, some breakfast meat, and then I was right back at my table. I never stayed away more than 30 seconds.
I didn't try everything like I normally would, but this was a special mother-daughter outing, and Eve loved the characters so much that it was worth it!
Our server was very nice. I do have a feeling if I had asked her to help me that she would have done so. I didn't ask for help. In a worst case scenario, I had it in my mind that I was going to give Eve a piggy back ride while I grabbed a plate of food for us to share. Luckily, it didn't come to that.
People ask for special requests from the chefs all the time. I would think in your circumstance you could ask for a plate to be brought to you. I would call and explain your situation to the restaurant several days in advance and see what might be possible.
Chef Mickey's is a special place. I love the photo of my daughter and me in front of the restaurant. It brings back such great memories.
If you would consider doing a breakfast, we do love Ohana's just as much, and it is served family style. Mickey and Pluto were both there in December 2008. Mickey was dressed in his Hawaiian shirt. It was a wonderful breakfast.
I hope it all works out and the two of you are able to have a special birthday celebration.