No problem.

The way I see it, you already shift most of your weight onto your left side when you throw the cross. On top of that you have some more torque this way when you snap your waist, shifting the weight back to your right side when hooking. You can get a good idea of this by throwing a cross-hook-cross as you would shift your weight from side to side for each punch. It just seems more natural than shifting your weight into your jab.

You could also slip inside of their jab. The body motion of slipping to the inside of a jab is similar to throwing the cross sets you up to throw a hard left hook, since your weight is rests on your left leg after the slip.