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We tow hang gliders to 10.000' with a 582 equipped Liteflight Dragonfly LSA every day in the summer. Our operation is at 5600 feet and 6200 feet in Jackson Hole, WY. So I guess I have the knowledge you're looking for.
Expect about 80% of the power that would be available at sea-level. It depends on your particular situation if that is enough for you.
But what is the density altitude running during those days? That's the big deciding factor. Personally, I wouldn't be comfortable trying to balance high altitude and low power but to each and to their own.