Dear Jim. You actually just need “K6” curves as long as it’s not the K channel that is dead. (these K6 curves drop the Yellow channel which is shade 7). All the K6 curves are available with the most recent commented edition at https://piezography.com/downloads/piezography-community-edition
After installing, open the piezography manual and look for “advanced topics” for remapping advice. If it is not the Y channel that is dead you can simply put the ink that would normal go in the dead channel into the Y channel use re-map the K6 curves to print with the Y channel.