Guidance on how to duplicate the user creation steps in a plugin - by: Ben_V

Sorry, I can't answer exactly to your question.
BTW I think you should be interested by a similar process for token... Maybe api offers a way to create users as well

www.limesurvey.org/forum/can-i-do-this-w...api-add_participants
www.limesurvey.org/forum/can-i-do-this-w...icipants-to-a-survey