Given that a lot of uses of a bushy knife is about carving wood, would a wood carving set be useful? For example a set comprising of a chisel and gouge would be very handy for all sorts of carving and one could add a demountable saw to the package as well for a light weight, all round wood working kit.
http://www.axminster.co.uk/products/Flexcut-Chisels-&-Sets-208266.html
http://www.axminster.co.uk/products/Flexcut-Chisels-&-Sets-208266.html