You know the Lenovo Thinkpad Trackpoint Keyboard II is a thing, right? It would seem to meet that requirement. What's missing?
Edit: Oh, they're pricey - so that, I guess?
>What's missing?
I like mechanical keyboards and the likes with a lot of key travel. So not a fan of these laptop keyboards. That and cost and availability too. That keyboard does not appear to be available on my country...
Have you read the post you're commenting on yet?