Well, from what I have seen on YouTube, people who feminize the pitch of their voice can go back (with effort) to the lower voice on demand, it doesnt seem to be "lost". In my own experience, I never use my low range (127Hz) but I always can if I want it, my top end is about 222Hz and mid (androgynous) voice is something like 176Hz to 185Hz which has been my default for a long time.
I would suggest getting voice lessons, they tent to give you greater control and flexibility, I haven't heard of anyone "loosing" the ability to sound masculine.
Because tone and word choice are so important in male vs female speech, if you get good at acting I dont see why you couldn't pull up either one as needed. Again, I say go for bbn it with the speech coach.