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Job variables (provided by a switch submit point) may specify a Width and Height for resizing but may also be expressed as a percentage.
I want to catch, fix, and set a page scaling factor.
Theory: If the final media box size calculates to being over 200 inches, scale it to 200 and add an output scaling factor to make up the difference.

There is no need to scale to 200 inches and then set a page scaling factor, just set a page scaling factor. To calculate it go via [Switch.Calculation...] and divide the desired value in points by the Defined value of [Stats.Mediabox...] (Defined and not Effective, because Defined is the value without any possible page scaling factor. Define that value in private data and use it as a variable in PitStop to set the page scaling factor.