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The best you can do is to place the back edge of the subject to be captured near the hyperfocal distance of the lens at the f/stop and distance desired. From there, the physics of the lens dominate DoF. I doubt the 90mm t/s will get it for ya in that situation, clearly your attempts proved this.
The only option I can think of to capture the entire scene in one image is to use an inherently sharp, longer lens (200mm or 300mm prime, for example) at a considerably further distance, such that the DoF covers the subject. However, this will compress the image, changing its look in a way that may not be desirable.
I would also be wary of f/22 that close as you may introduce artifacts into the image from aperture diffraction.
I think your composite is very nicely executed, it sounds like a solid technique and wouldn't be difficult to automate in Photoshop.
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