TG is usually very good at checking bags to final destination even when on separate tickets. So if you show your onward ticket with QR I expect the TG agent at HKT will check your bags to final destination and even print all BP for you. If the TG agent is willing to do it for you, you will clear immigration at HKT and get CIQ sticker to wear on your shirt/jacket (to identify you as a domestic -> int transfer pax).