If by NW Cutlery you mean Northwestern Cutlery, simply ask them to do the knives on whetstone only. Though the two grinding wheels they use hardly, at least in my mind, equates to the metal reducing fully automatic sharpeners used by commercial sharpeners.
If still not comfortable with Northwestern Cutlery, another option is to send the knives to Korin
in New York which offers a hand sharpening service. I've not had knives sharpened, but have purchased knives from Korin and been pleased at all my interactions with them.
Korin Japanese Trading
810 W Lake St