I believe we need to look at the bigger picture, and that a handling code for barbel should be just one part of a larger, all encompassing 'fish handling code' with specific advice/guidance for each species. As one size does not fit all with regards to unhooking and looking after the fish we catch, nor is one species more worthy than another, some need different care yes, but none are more worthy.
An all singing, all dancing 'official' guide could easily be produced so long as the major players, NFA, EA and elected reps from specialist, match (game and sea?) circles, show a bit of foresight and common sense with the sole agenda being the welfare of the fish we catch. Possibly this could be led by the press, BS, FM whoever.
That way, we have an almost universally agreed approach for each individual fish. From which could come a simple leaflet explaining fish care for each individual species, this could go on every shop counter, in every magazine, and be included with every licence sold.
With no political agenda, and all groups being represented by their officials then no one need feel they are being dictated to, and no one gets left out!