Highwood pass is the highest point accessible by car in the region and has a gravel track that would likely be easy to do in a wheelchair with a freewheel.
I drove up there late in the afternoon hoping to tackle the track, but got stopped pretty quickly by this sign:

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The rangers keep a pretty good check on bear-human activity in the park, and try to keep interactions to a minimum, especially mothers with cubs who can be quite aggressive. Many of the bears are collared and rangers can track specific movements. Turns out our bear was in a nearby patch of forest less than 200m away. As awesome as it would to be to see a mother bear and cubs, I didn’t fancy my chances. Good decision as the drive back was pretty wet!