I think you're running a little ahead of yourself and perhaps missing the point of what this is primarily meant to do. The idea is to create a profile which is then used to constrain a bed o nails type probe. How you go about creating the profile is up to you - you can skip the edge probing and draw it in CAD if you like. You just then feed that into the 3D routine. The edge probing is there to help with that if it's appropriate. You might want to try it before you think up all the reasons it "won't work" for some given situation. This routine has been in use for several years by pros all over the world from luthiers, gun stock makers, reproduction moulding manufacturers to name a tiny few.