It's definitely within the realm of possibility! There's been a lot of research in hypnosis for state anxity (i.e. before a test) so I think it makes logical sense that it would help with the fear of public speaking.
On the anecodtoal I know someone who has had significant success using hypnotherapy for public speaking.
On the anecodtoal I know someone who has had significant success using hypnotherapy for public speaking.
Definitely worth exploring.