Also /d/ + /ʒ/ does become /d͡ʒ/ in English (and potentially all languages that have /d/ and /ʒ/) so even if you had a single symbol for /d͡ʒ/ that was unrelate

Also /d/ + /ʒ/ does become /d͡ʒ/ in English (and potentially all languages that have /d/ and /ʒ/) so even if you had a single symbol for /d͡ʒ/ that was unrelated to that for /d/, the relationship between /dʒ/ and /d͡ʒ/ is still close.