Hi Richard,
That's a lovely task!
Given how the pillars aren't very large, I think you can get away with shooting the whole wall at the same distance (approximately on the same line as the pillars are) with a wide-angle lens (24 mm), and then stitching the images together on Agisoft PhotoScan Pro. Moving in parallel to the wall, when you get to a pillar, I'm pretty sure that when you move to the other side of it there will be sufficient overlap for this not to be a worry.
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