Well if you want to do it stealth kind of like I did, there is a way to do it
. My trained voice was terrible as it was in the male range. The reason for it was because I was bass which is the lowest male voice, think Jonny Cash or James Earl Ray. In my trained voice my working pitch was about 130-140 Hz. Nobody ever commented about it however I lived with that voice for about 36 years. Last year I had voice surgery which kept me away a week and then I had a couple of more weeks recovery where I couldn't speak and then weeks were my voice sounded pretty bad.
Your game plan could go like this. Tell everybody you found a surgeon who could fix your voice, take a week off and then a few weeks where you don't speak. When you start speaking, nobody will know the difference.
In my case, it was mention that had surgery accidentally. Somebody walked in while I was showing my mother my surgery pictures. I suspect that spread around the yard pretty fast. When I could speak again, everybody must have expected a difference because nobody ever commented on my voice.
You would remain stealth and nobody needs to know you didn't have surgery. Voice surgery isn't real common so few people know the details of it.
