I 'feel your pain'. I shattered my ankle (it's pinned and plated now) and have lingering mobility issues with it.
The PT working with me was also a Disney-phile so we worked together for the final months of PT to strengthen my ankle as much as possible. I was in PT a total of 7 months finishing up just 2 weeks before a trip to
Disneyland!
I didn't use an
ECV but did wear a (and still do) a good ankle brace. One of the things I find that really helps me is avoiding stairs. Partly due to flexibility and stability issues but it also seems to help me 'last longer'. You don't need a
DAS, just advise the CM at the ride that you 'don't do stairs' and they'll assist you. That and taking it slow (no 'speed walking') and frequent rests along with flexing exercises helped. I'd also advise taking meds for pain/inflammation in the morning and through the day. When you get back to your room at night, elevate and ice your ankle and take meds before bedtime. Don't wait to feel pain. It's easier to prevent it than to make it go away.
And don't rule out an ECV. I told myself I'd rather use an ECV than spend my trip in the room in pain or have to cut short park days.