If you use an action in an <html:form> tag, it must have an ActionForm associated with it. There is no getting around this rule.
In your specific situation, I see two differnt ways you could go:
In your confirmation screen, embed all the data in <html:hidden> fields that correspond to the data being displayed with <bean:write> tags. Then just make the "OK" button a submit button, and the form will be submitted with the data