I run a control tech and trek icon 1" road stem on different mtbs with normal mtb handlebars with no problems. I'm fairly light - 11 stone or ?160lbs - and both are 1 bolt stems. This means as you tighten the bolt past where it would be with a road bar, the two halves of the clamp almost but not quite touch before the right torque is hit. Try it - if the two halvs touch then it deffo won't work, if they don't, it should*
Ian
*SSBonty takes no responsibility for chipped nails, dusty lycra or death resulting from loss of control if in fact this bodge doesn't work.