Sorry, but this case does not set precedent that corner crossing is illegal. Building a road over a corner and stepping over a corner are two separate things. Maybe you have skin in this, maybe not, but there is no definitive Wyoming law that makes corner crossing illegal or that it violates private landowner's rights. But you already knew that.
Prove it, you keep claiming that there is no case law that set a precedence, I proved you wrong. Have you read this case? I suspect that you haven't, if you have then explain to me how it does not set a precedent for making corner crossing illegal. If corner crossing weren't illegal then this whole discussion would never have happened. Justice Warren E. Burger said in his summary
"We are unwilling to accept the Government's invitation to upset
settled (emphasis is mine, settled means that the expectations of land owner have already been proven under the law) expectations to accommodate some ill-defined power to construct public thoroughfares through private property without compensation".
In other words, unless you get permission from the property, who has been compensated to his satisfaction (which may or may not include financial compensation), you can't cross his property.
Stepping over a corner still requires that you violate the space above the property, space that is considered private property. Again, imagine that both adjacent property owners built fences to the corner. Further, imagine that the fences are extensions of the property lines. If you want to cross at the corner then your body would have to cross/touch the fences/property lines on both sides of the corner (your body occupies 3 dimensional space; height, width, and depth) which means you that you would have to trespass.
Once again, making up an excuse to try to get around the legalities just isn't going to work. As I've said several times now, even a reasonable amount of air space above the ground is considered private property, if that weren't so then nobody would have any rights to build structures that were any height above the ground or plant trees. If you understand my point about imagining a fence rather than invisible property lines then you will understand that the ladder will still violate the air space above the ground.