Digital BW, The Print

At work we have a 2200 with Cone neutral K7 inks.  We'd like to replace 
the Cone inks with a good but less expensive option, and we're 
considering Paul's Eboni-6. Would we have to flush the K7 inks from the 
printer, including the parking pad? If so, how do we do this?  In 
addition, we have a large stock of Photo Rag and German Etching.  How 
well does Eboni-6 work with these papers?

Thanks,
Peter