Haven't done this myself. Theoretically, it should be fine. There will be a ton of stat conversions you'll obviously need to make, and treasure adjustments for XP (maybe use Hunter Mode).
Follow the advice of page 193, of course, but consider the 10+ bump to be something more like [Avg. party level 10-12 = monster LV 7] and [Avg. party level 13 = monster LV 10]. But scaling monsters to that level will require work. For the high ones, Mordanticus is a good starting point, I suppose.
I, personally, would do the reverse: fit this level 10-13 campaign into the Shadowdark 7-10 LV range, adjust treasure for proper SD XP, and convert the monsters very liberally. That's what I'm doing for the 1e Dwellers of the Forbidden City which I'm dropping into open table Greyhawk pirate-y hex crawl treasure hunts for this summer.
Good luck!