This guy has been wanting to transplant a human head. His idea gets picked up, but I figure ethics committees are shooting it down. I've seen quite a few countries support this now, only not to follow through with the announced date. I can only assume it was turned down by ethics committees. Here's a couple:

Head transplant surgeon Sergio Canavero—a dangerous maverick or medical revolutionary?
http://www.newsweek.com/head-transplant-surgeon-sergio-canavero-dangerous-maverick-medical-revolution-709332

Italian doctor says world's first human head transplant 'imminent'

https://www.usatoday.com/story/news/world/2017/11/17/italian-doctor-says-worlds-first-human-head-transplant-imminent/847288001/

Here's his TED Talk:

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My idea is a bit different. When a person dies, they have an option to freeze their body. Sometimes only the head is chosen. In this idea, you only need the head.

This solves the problem of where to get the head and legalities were taken care of before the person died.

Now the body that will be needed. I believe what's needed can be created. An Artificial Intelligence body is not unheard of.

Now put the two together. That makes a cyborg doesn't it?

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The body I envision is more biological. It will take a very long time to map the brain and develop a blueprint. We already possess the technology to put together a body. The end product will look more like the Terminator than a robot with a human head.

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To bring those frozen bodies and samples back, do like they did in the movie Jurassic Park, except you will need a human embryo and someone willing to give birth to an ancestor. Some sort of legal agreement will have to be developed that can be signed before death if the use is for a non-family member. It may be as simple as a sperm bank's legal clause.

Technically, you won't need a whole head. I understand one organization also collects tissue samples. You'll just need some blood. This would be considered children, although they may have the same physical appearance.