I know that it's not possible to convert a contact back to a lead.  What about creating a new lead using existing contact or account details?

We would like to create a system in Zoho CRM for following up past clients to see if they require our services again.  Currently I am manually creating a new lead for each client, which is time consuming.

Is it possible, with a workaround or script or something, to automate creation of new leads from existing contact details?