Let me say that I feel for you mommy. I came to this section to find info for the exact same reason that you're posting.
I am sure most people who replied didn't mean to come off as unsupportive but I think it can be hard to be told there are no exceptions for something that a child can't participate in. It is hard to explain to those who don't have children with special needs but having "one" more thing your child can't do and to have to pay a fee for them regardless if they use it is really not ideal.
My lil one is not quite 3 and at each trip has been fed via tube. We have never done
DDP before and we will be doing it in March when we go as it'll be the last time she won't be charged.
If we do end up liking DDP, we hope she will be able to "eat" by the next time we come but we also have accepted that may not happen and we will have to end up paying for her and using the credits for us or others in our party.
It is bittersweet because you don't want to be reminded your child is different and my heart understands your frustration and also wishes it was different.
Have a great time on your trip and I hope your (not so little) one has a great time regardless.
*hugs*