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In 2019 Autodesk introduced an ability for the Pipe system to maintain a certain length, and recalculate a different path for flexible pipe. This may be the first of its kind to do precisely what you asked.
For standard sweeps, you can extract the sweep length via code. Then use that sweep length to have the user alter the object, or attempt to automatically alter the object. Being that a sweep path is usually a compilation of different curves, it would be difficult to say 'where' to remove or add more length, without carefully modeling segments that are ridged and segments that are flexible where needed, and labeling which is which (maybe by linetype or color or something simple). Then you could write a program that reads the sweep length compares to the nearest marketable chain length, and stretches or shrinks the flexible segments evenly to meet the overall desired length.