There’s just no perfect solution. It’s a triangle between speed, portability, and price, and you get to choose two of these three. The result is always going to be a compromise.
That said, I think you could compromise on the speed side of things: My recent performance analyses have shown recent CPUs (with LPDDR5X memory!!) to be quite capable. So much so, that they outperformed dedicated GPUs in editing tasks (but not export) in Darktable.
If I were in your shoes, I’d look into the latest AMD Ryzen AI 300 series laptops, or indeed ≥M2 MacBooks. I know these would be plenty fast for my editing needs, and not nearly as power-hungry, bulky, or expensive as a dedicated GPU.