I would like to build a process where a form initiates a repository user password change but don’t seem to have an activity that does so. So, feature request? Any suggestions on other solutions?

Here is my case use. HR employee hiring jackets. We have internal investigative units that randomly need to audit individual jackets for a variety or reasons. Internal administrative investigations, hiring needs, promotions, criminal inquiries and such. Well I want them to request access via form, that form gets approved and that kicks off a workflow that duplicates the needed jacket and moves it to a separate repository where a repository user is given access. That repository users is given a unique and temporary password that will be active for a predetermined amount of evaluation time. After the timeframe, the workflow changes the password and deletes the duplicated jacket. This proves will most likely cycle through several temporary user accounts. 

Any suggestions would be greatly appreciated. 

Webaccess would be the interface.