@marlene00 - It sounds like you currently have some users with licenses already. I would highly suggest that you first contact your HubSpot Account Manager and discuss your current license structure and what you are trying to do. You would be surprised what they can do to help you.
Answer 1: There is no workaround with workflows to get deals assigned within HubSpot.
Answer 2: Zapier and Automate.io can achieve what you need but may need a paid license. @Bryantworks is an expert at setting these up and may be able to give you some insight.