The pinebook pro is close to that. It has a different software ecosystem, but is also much faster when web browsing than a Pi4: https://www.pine64.org/pinebook-pro/
I want something I can put my favorite arm sbc inside.
You can do that with this laptop, as long as the RockPro64 is your favorite ARM SBC.
(Disclaimer: I think the specs match, but the form factor of the laptop board might vary.)
Yes! A good, close-to-pro level Pi based laptop. Brownie points if it includes a SDR.