You can but some saddle height with a long mtn bike post, so that shouldn't be an issue. You may not need setback because the seat moves back with height anyway (by virtue of the 73° seat tube angle).
The stem may be more on an issue. You can get more forward extension, or you can get some more height, but longer and taller stems are like hen's teeth. You might take a different approach by firring a threadless stem adapter and using a high angle stem of the right length upside down, so it rises.
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