We’ve done this on quite a few projects lately with the technique you mentioned — expansion joint and sealer caulk. A good example in my opinion is Flatirons mall (outdoor section), particularly the area behind BC Surf&Sport there are a number of irregular sandstone boulders set in concrete.
Depending on the size and shape of the boulders, you can pour pads for them (6″ to 8″ deep with reinforement) and simply set the boulders on the concrete pads. Might be an easier way to go. Your installer will love you.
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