As for the 'teleportation must be instantaneous' thing, it might be helpful to just freeze whatever we're teleporting, and if it was alive, revive it when we thaw it out. That way we could spend much longer on each person, and things would only need to be within the tolerance of a frozen person, not a conscious person. You'd also fix many of the ethical issues, as neither of the two partial instances would be conscious.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT