If you have to sit down on the dock to board our watercraft than that is a major safety issue. So yes we would have to refer you to other modes of transportation.
You do have to go out on the dock to get on the boat. If that's not possible for you, you could take a bus.
Take the Minnie van. You get where you are going without having to think about it. It is well worth the money.
I guess it depends on if you can walk on it at all or not. You will have to take a few steps onto the boat. If you can't do that, you can always take buses to get to magic kingdom. You'd have to take a couple different buses, but you could do it.
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