I've see two methods for rehabilitating pipline in place. Insituform (trade name) in which an expanable elastic lining is blown into an existine pipline and cured in place. The other was to drag a "Pig" through an aging pipline that would break the old pipe in place and pull a new continuous pipe through the broken old pipe. These methods are at the industrial / municapal scale and not suited for pool piping. They are both "spend millions to save tens of millions" types of ventures.
Dig we must.
Or cut / cap that return line until you're ready to cut the deck.

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