I had thought about the subject yesterday, whilst at work and I am thinking now........that a radical alteration of these will not be essential for successfully passing.
I guess that I am primarily considering the pitch and frequency range aspect of this, in essence.
I have clearly confused some in phone conversations and I did not 'force' the feminine vocal in these instances. The adaptation and shift toward the feminine vocal may not require a great deal of effort to implement, as had been previously thought.
But clearly, some effort will needs be necessary, as I have been 'speaking male dialect' for 40+ years.
But it is truly a labor of love and joy - and triumph.