You only mention your laptop is running out of space so you need to get a new computer? does your laptop have a soldered SSD? If that’s not the case, I think the reflex should first be to see what storage you can get your laptop so that you can keep using it rather than discarding it :(
This was already quite a significant challenge compared to socketed RAM, but now with Lunar Lake I guess this is simply impossible? The RAM chips are colocated with the CPU…