You say the dubs are not a destructive cult, yet in your next paragraph you talk about the possibility of your father's "turning you in."
If you don't consider a parent's betrayal of your love and trust as destructive, you need more help than finding alternate venues to speak in public.
Perhaps a support group for former cult members would be the best place for you to talk.
Even so, I wish you the best as you try to disentangle yourself from the dubs.