THE possibility of becoming a Beijing adviser was ruled out by the departing health chief yesterday. Elizabeth Wong said she would not accept the appointment even if the Chinese Government approached her. ''I prefer to serve the public on my own rather than being restrained by any groups, organisations or government,'' she said at her farewell press conference yesterday. She said, however, that the Chinese Government had not yet extended an invitation to her. Several retired senior officials, including former chief secretary Sir David Akers-Jones and former secretary for lands and works Nicky Chan Nai-keong, have been appointed as Hong Kong Affairs Advisers by Beijing. Mrs Wong also denied joining the Former Civil Servants' Association, founded by Mr Chan and other retired senior officials, which seeks to cultivate links between civil servants and the future sovereign power. But the outspoken health chief is not planning to step out of the political limelight after her retirement. She is now considering running for the Legislative Council elections in 1995. ''I would like to continue my public service after I leave the job, and serving in the Legislative Council is definitely an effective venue.'' But she will not try her luck in direct elections, but will rather set her sights on functional constituencies. She added that she would not join any political party, and would instead run as an independent candidate. Mrs Wong, who holds a New Zealand passport and is employed as an expatriate officer, was told to stand aside in April by the Government to make room for local officials. She turns 57 next month, which is also the retirement age for expatriates. ''I still regret that I have to leave the civil service,'' she said yesterday. Mrs Wong has been in the Government for 25 years. She has served in various government branches and departments and was promoted to the post of Secretary for Health and Welfare in 1990.