I don't see the reasoning behind bending to the outside - surely that's going to make it more difficult for the horse to strike off on the correct leg?
My aids for canter are as follows, pretty standard for english:
Usually done in a corner of the school or on a circle, so the horse should be bent to the inside anyway
Half halt with the inside rein (precedes all transitions, ideally)
Sit deep in the saddle, weight ever so slightly to the inside (I would normally have been rising to the trot, so this is a change)
Outside leg moves back and pushes on
Often accompanied by a cheery 'canter!'
I don't always use all those cues, depending on the horse and what I'm doing. A couple can be exaggerated to help a horse who has trouble striking off or getting the correct lead. Then again, I ride a few horses who need as little as someone sitting and brushing with their outside leg to strike off beautifully.