Bob, if you have access to an oxy-acetylene torch, get hold of some case-hardening compound. You will be able to harden the outside of the steel to a reasonable degree. Not as good as the whole hardening and tempering bit, but will give you some additional longevity. Do it before final cleaning and polishing of the blade, as there may be some discolouration - in fact, try it on a piece of offcut from you bar first.
Not sure if you can get case-hardening compound in Cyprus, but will be available from the UK.