I managed to open your .dwg file and save as R12 dxf, but you must move your profile to the required quadrant (RH end point at 0,0). However still not getting true result, but it does load into Laziturn. Modified DXF attached.
Ezilathe might be an option if you can add a couple of lines to your dxf to guide toolpath over gaps in profile at change of tool (LH to RH).