AS we are all painfully aware, Beijing has other plans for the crusty Hong Kong Club come 1997. In fact, Keeping Posted's deep penetration agent in the Forbidden City has been privy to the blueprint and we can reveal that the dining room will be converted into a tea room-cum-karaoke bar for cadres, while the Bowling Alley Bar is to be a beauty parlour. (Rumours that club committee members will be dispatched to re-education farms appear, for the time being at least, to be just that). How sensible then that one of the leading organisations around town, the British Chamber of Commerce, which for decades has found a natural refuge within the club, has started making other arrangements for its recreational activities. For this evening, stiff upper lips will be loosened and old school ties unknotted as the members take over the music room of hip-hot niterie JJ's for its monthly gathering. (Admission $100 and first timers welcome). An insider tells us that the chamber is moving away from the ''standard, slightly stuffy receptions of the past to the happy hour concept''. As the cobwebs are cleared at the chamber we detect the hand of new executive director Brigadier Christopher Hammerbeck behind the duster. We are told that he has brought a ''more innovative approach'' to the affairs of the organisation. Although the Brigadier's gallantry in the desert during the Gulf War preceded him to Hong Kong, it is generally agreed that he only ''arrived'' when the beautiful people kept wanting to have their photographs taken alongside him at chic cocktail parties. Why, at one such event, a glamorous socialite lingering near Hammerbeck turned to Keeping Posted and whispered: ''Don't you think Christopher is such a darling?'' In this town, not even a knighthood could match that sort of accolade.