When I am out hiking on poorly maintained public trails I will bring hand clippers to clip my way through. The clippers are part of my ‘bat belt’ and are stowed in a leather holster for quick access.
If I see an invasive species (eg bamboo, Himalayan blackberry, scotch broom, ivy, etc.) I will not hesitate to lop, uproot, or generally try to kill it if I can. Killing invasive plants is improvement of the ‘natural environment’ and should be normal practice just like CITO.