I've converted the rear axle of a couple of bikes to QR (< 10 years old). It was a bit of a pain. Inevitably the axle sizes or threads are different so one can't just move the cones and spacers directly from the old axle to the new axle. So you have to find a new axle, and matching cones, spacers, and lock nuts. And if the dust seals are integrated to the cones, they may need matched too, or moved.

Inevitably one gets the rear spacing off just slightly, and needs to adjust the dishing of the wheel.

A cheap matching donor hub may be of benefit.