People with this issue have sometimes rigged an arm off the Z axis of their router that extends to another table next to it with a water-bath and racks for plasma cutting. This works because there isn't any resistance to the torch from the material; it just has to be in the right place at the right time. You might look at your garage and see if this might work for you. But note that even with the water table, CNC plasma cutting is a really messy process; the air fills with fumes and burnt-metal debris that will settle on everything in the vicinity, including your tools and wood and other machines.