i can not agree your advice. in fact at china trade dollars is not chinese counterfeiters' favorites.
UK trade dollars product is good and with Classic Side of the gear and not Complex as chinese coin , so it is easy to Distinguish.
at china, all coins lover often discuss copy coins. of cause at china easy to find copy but most lovers do not love copy and sell copy, every time and every where we still want to do some for stop copy. i know your advice is good, but i want every lover knows : chinese do not love copy, and want not promise copy. but this is a big questions , i wish some years after all lover can change their think about china.
i think NGC , PCGS etc.. is a good way to help work for stop copy on market.