Thanks everyone. To clarify, the issue for me is that my kiddo just can't wait in a line that is 30 minutes long. We don't mind waiting outside the line, and aren't trying to get some super quick front of line treatment. The disney website specially says that
DAS may not work for guests who have limited time in the parks, and to discuss the need for alternate accommodation with guest services, but it sounds from what you've all said that there simple aren't any other arrangements. Touring Plans estimated this week as 1-3 crowds, which is why we planned this week (from 2000 miles away). I think Disney is handing out a ton of fastpasses at MK in particular, resulting in longer and longer lines, which dilutes the accommodation that was set up several years ago for everyone who may need a DAS.
(For anyone coming in late, the kiddo has autism, can't walk or help transfer, severe epilepsy, a feeding tube, is incontinent and cognitively disabled, we are not trying to get a free ride, but just make the vacation possible.)
Thank you all for your good wishes and excellent suggestions.