You don't happen to have a granular type sampler thing? I'm sorry I forgot the technical name, in FL it's called the Fruity Granulizer.
It stretches on pitch and time too.
What if you stretched the sample outside of your DAW in a program like Audacity? Audacity has settings where you can transpose pitch without changing time. More work, but it turns out alright.
Sorry, I'm not much help.
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