I dont know anything about honing safety razors. I do know there are hones designed for them. There's an antique store close to me that has display cases full of the Goodrich hone for safety blades. There are a couple on the 'bay that are similar design, but overpriced IMO.

some pics of a goodrich hone here:
Vintage Goodrich Razor Hone by TinyVictories on Etsy