Thank you for the suggestion but the B6000 is about 35 years old, so I am told - and professional advice is that parts will not readily be available to enable this to be successfully or cost effectively done. Apparently it would be cheaper just to replace all my 3 implements.
Personally I think this is shame on Kubota that they allowed a change in tractor design to occur without making provision for solving this particular problem, which is the natural consequence of this change.