Buy this claw for night walker revamp?

Buying the spell traces from FM, it cost me less than 2 mill per scroll for the 5 att using the spell trace system. I have seen some say Diligence and the Guild system bonus for success rate effects Spell Trace scrolls and I have seen others who say it does not. I have been fairly lucky using it for scrolling items for mules myself. Looks like you could find a clean one in scania for between 300-400mill so I would be tempted to try self scrolling first.