I have this fantasy of making a sleeper laptop with a whole bunch of Raspberry Pi’s and having a dedicated Raspberry Pi that operates as a KVM so you could have complete hardware isolation in a laptop.
If you have the laptop, you have the laptop. Breaking it into pieces doesn't add any security. If you don't have the laptop and are attacking remotely, it's no different than if it weren't physically segregated, whatever the hell the point of that is.