1-2: It’s not impossible. There’s a design out there for a dev board that can adapt the FXBeam connector to PCIe: Expansion Bay Developer Program - #5 by nrp
I probably wouldn’t use it for anything except expansion bay module development.
3: Unfortunately not.
As you have may have realized by this point, swapping out the dGPU module is too inconvenient for this plan to make sense.
Even if you only infrequently install the dGPU in the laptop (e.g. during travels), then you will be stuck with an overpriced mobile-tier GPU for your desktop workstation.
You should take in to account that:
- The APU has totally sufficient graphics for occasional low-fidelity gaming on the go, it’s definitely better than you think!
- The dGPU module doesn’t consume power unless you’re actively using it. Also, even without it, this laptop does not get impressive battery life.
I think either leaving the dGPU installed, or not buying it, could make more sense, depending on how often you’re away from your desk.