I don't have an answer about the beach scooter, but knowing the resort itself, there may not be too much of a need for one? Aulani is a big resort and accessible. The beach area is small and has a cement path all along the outside of the lagoon which is regular scooter accessible. So depending on how much time you would spend on the sand itself would be the need for a sand scooter. And I do believe they have or rent sand wheelchairs, at least I have seen them there if that's an option? Sorry, I know that wasn't exactly the answer you were looking for, but hope it helps some
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