What if we removed the APU from the 4700s and replaced it with the APU from the PS5?
Please ignore the fact that I could potentially kill both devices.
There is no reason to think the PS5 APU wouldn't have graphics enabled.
It is likely that with a driver and passthrough to a simple video out card like a 1030, (like laptops do when they have more than one GPU, or when they use those "IO less" mining GPUs to play and all), we'll be able to use some of the PS5 GPU in games and would perform better than using an equivalent GPU because the PCIE slot is limited.
Power delivery is another concern.
How much power can be delivered by the 8 pin connector alone?