The only reason to have a desktop PC these days IMO is if you need something very powerful (for gaming, video editing, CAD etc.), otherwise laptops today can generally have plenty of power for most people.
So, yes, I’d just buy a dock for your FW and use that. Also worth getting a laptop stand to improve airflow around the case just in case things get toasty.
I have Anker 65W and 100W GAN charger and both should work fine with the FW13 although one reviewer reported that a 65W charger (FW’s own) cannot keep up with power consumption during intensive tasks so the laptop keeps flipping between AC and battery power. General consensus seems to be get a 100W charger to be safe, especially considering they’re not much bigger than 65W ones.