How would using parts from a Devil Fruit user as organ replacements - or in the case of segmenting, limb replacements (the limbs are still alive, after all) - actually work? Like, would the one receiving the donation *also* end up with the Devil Fruit power?

Good lord...imagine if Luffy got cut up for organ harvesting to create an army of Luffies...

The "only one person at a time have a given power" rule would probably prevail.
Now i wonder, if we get a someone's brain and surgicaly put it into another body, would it get the power. Information is stocked in the brain, but the part that actually ate and digested the DF would be the body.

We do sort of get a hint of what would happen during the Punk Hazard arc with two DF users.