If landowners were prepared to trust the overwhelming proportion of the public, who are law abiding, responsible and largely more supportive of their interests than the reverse, they might have seen that technology has provide the tools to overcome this and many other problems that they fail to deal with.
Most people carry mobile phones today, when I go to the cinema an usher scans a QR code immediately knows that I have payed and where I can sit.
A simple device that could be tacked onto the way mark posts the landowner and his supporting cast try to destroy.
Should such a simple idea be explored by a more imaginative generation of landowners than we are blessed with today, I think safety protocols that circumvent the fears of invasion of precious private land as orchestrated by Lawyer / Landowner Sarah Slade could simply fall into place.