This is why it won't happen. They aren't going to make such a large die SoC that requires a whole new expensive board and sell it at $1000.A Halo handheld at $1000 would be a true gaming device replacement. Halo-type handhelds have the potential to disrupt the entire gaming market from desktop PCs to dGPU laptops to consoles.
$1000 to you means the whole system has to be $800 or less. What is AMD getting out of that? A good LiPo battery, a well built high quality case, large 512GB or more storage, 32GB or more RAM, complex board to support 256-bit interface, a high resolution high refresh rate OLED(because it's a fad, not because it's good but still) touch display. All that for $800. Not happening anytime soon.
It can work if it has volume, but that's serious volume you are talking about. This is why Nvidia's stranglehold is extremely difficult to breach. They already have the volume. They already have supplies ready to go. OEMs have been making boards on it for years and years.
What you are saying is what few of us has been saying and known for years. Halo iGPUs are desired because of the mentality that iGPUs are cheap. You aren't getting that with the Halo version.
The solution to AMD is same as Intel. Don't give up. Keep trying. But they have similar attitude as Intel in many things. They give up too soon.