You just joined this site a week ago. So, unless you're a grizzled old bonsai veteran with many years of experience at bonsai who just happened to recently discover the magic of the Internet because your grandkids finally showed you how to get online.... just don't. Leave the tree where it is. Stick around and learn first (for several years) before you even consider trying to collect this yamadori.
Odds are that this "non retrievable yamadori", if it's really cool looking material, is a really old tree and the tree's age greatly reduces the chances of success with an air layer. There are also species that typically do not layer well (if at all). Pines, for example, are known to be quite difficult to layer. There are ethical and legal considerations surrounding collecting trees from the wild. You need to know what those legalities are and be aware of how your actions affect the perception of the hobby by the general population and by relevant organizations (BLM, U.S. Forest Service, etc.) that have decision-making power to grant or deny permits for tree collection. It only takes one rogue collector to rub the wrong official the wrong way and permanently screw up collecting for everyone by convincing that official that issuing permits is not worth the administrative headache or creates a "tragedy of the commons" situation that conflicts with their natural resource management duties. You only get one shot to get this right, so have patience, learn the horticulture first, practice on less precious material (nursery stock) first, and get the necessary permits/permission before you do anything.