This has been done before, with Mongolian, and Manchu, and pre-Hangul Korean, and Japanese, and virtually every other language that neighbored on and fell into

This has been done before, with Mongolian, and Manchu, and pre-Hangul Korean, and Japanese, and virtually every other language that neighbored on and fell into the cultural orbit of pre-modern China. It never really worked out that well, and almost universally was replaced with alphabets of one variety or another eventually, because it is impossible for people to become fluent without an absurd number of years of study when reading and writing in ideographs; at least comparable to the very short time it takes to train someone in an alphabet.