Wow. Have to respect someone spending time on the GMA500. It was terrible when new, I recall Ubuntu being barely able to render desktop without lag. Windows was better but still unpleasant. The vaio p’s odd screen aspect ratio was also a challenge.
I’d love to see someone retrofit a modern soc into the vaio p motherboard form factor. There were a few partial efforts on GitHub but seems like Sony’s miniaturisation skills remain undefeated.
Not quite the same thing, but you can build a similar thing to run linux relatively easily, and the keyboards can be really good that way. You can swap out the SBC for one of your choice eg. https://www.lattepanda.com/lattepanda-iota (why don't AMD do small SBCs?) and cut a space on the left/right hand side for a trackpoint/optical trackpad (operate from the side)
https://github.com/penk/penkesu