The only "forced stretching" that works without known detrimental effects is to tune the guitar up 1-2 steps but it only accelerates the settling process and you still wind-up with the instrument being "out of tune". Even this method cannot address the issue of the trebles settling in slower than the basses, so you will have to keep retuning the trebles anyway.
Just accept nylon for what it is and don't change strings when you're days away from a gig.
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