Hi Russell, sorry I missed this post.
It really is quite a simple process and just involves buying a lm and lc cartridge. You can use the existing 2 x CMYK in the 1 x CMYKlclm layout. Make sure your waste tank is empty as it will need to empty the lines, go to maintenance and head wash and follow the control panel instructions until it says ‘set wash tool’. At this point you are expected to insert 8 x wash carts which is ideal but not essential. If you are not doing a flush out, just switch the printer off and and then back on again and it will as you what ink type you are using. Assuming you are using full solvent and not Eco, set the control panel to SS2 SOL 6COL and it will tell you to set the cartridges again. It will then continue to fill up in 6 colour.
Now it’s just down to the RIP. What RIP are you using?
Stafford