You mentioned a 3D version. Would that be a STL file? Or a sketchup?
I don’t know sketchup, there may be a way to export out of it a 2D curve ether as svg or dxf?
You can’t import a 3d file into Easel as easel only does 2.5D (2d with different heights)
You need a different software to generate g-code for 3D carve. There are several. (there should be a few threads on software)
I grabbed the PDF and used inkscape to trace it, then imported that.
I used to use tinkercad to “Flatten” a object by exporting it a SVG (just the part that intersects the 0 z plain) It is crude but worked. (I now use VCarve that has an outline curve function)
As for more info on cutting your own plates you can see my attempts in this thread: Gantry Upgrade to C-Beam