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Ipe', Cedar, Redwood, Cypress all come to mind as good woods to use here.
Tough mother to nail too we needed a bike impact wrench to put in the drywall screws... anyway it doesn't float. May be a prime wood for this particular use. Have you heard of it?
I'd be worried about anchoring the duckboards through the membrane but with iron wood since it won't float it would be perfect no?