No, this isn't possible, as these are different data-types.
You could write a custom workflow activity to do this, but you'd need to have logic to cope with matching the lookup on 0, or on more than 1 record. I don't think you'll find any general tools that would do this, as any output parameters with a lookup data-type
have to have the entity-type defined at compile-time, so it's not possible to write a generic tool for this
Microsoft CRM MVP - http://mscrmuk.blogspot.com/ http://www.excitation.co.uk