My recollection of rope soloing Anne Marie in 1991 was that it was more of a face climb right of the obvious crack. At the point where the crack steepens, climb right over 5.8ish face climbing to ever lower angle rock. Pro was not as abundant as I wanted on a route with a crack on it, but is probably adequate for most. Top out requires care on lichen and moss covered slab to eventually bushwhack into the trees to rap.
The route may be easier than 5.8, but I'd recommend being solid at 5.8 LGR slab before venturing out to this route. Plus, it's a long hike to this route without other options for routes in the same grade.
All in all, it's a great adventure route that gives you a beautiful view of the Hidden Wall. The setting at the base of the Hidden Wall is beautiful too with boulders and grass landscape.