Someone in publishing was asking me that the other day.
The entertainment biz still doesn’t get it: the thing to do is not to laboriously try to imitate her inimitable Alabama/New York/London accent or the timbre of her voice as it sounded in her final, gravelly years.
Instead find a woman who can act, hopefully has good bone structure and ash-blonde hair or a face that looks good framed by hair dyed ash-blonde.
Then let said actress (No I am not giving up that word), act, rather than mimic the part.