There are a lot of alternatives to international schools. There are quite a number of "hybrid" new local schools (private or DSS) that serve local children. They are extremely popular amongst local parents who want something other than traditional local education, and yet do not feel comfortable with a total English environment. To name a couple, Pui Kiu and PLK CKY are two of such kind of schools. Cantonese would be the main language of use in those schools and I believe such school would be more suitable for you.