I'm kind of surprised you haven't had much feedback on this so far.
Most decent knife steels can handle anything down to 12°-15° per side. The older 'Queen Steel' blades were 440C, which should handle that. If the knife will be used for normal, non-abusive work, it should be fine. Heavy use in tough or abrasive materials might warrant an edge angle a bit wider (15°-20° per side). Shouldn't have to go any wider than that.