I appreciate having a straightforward PSR as you wrote. That's good.
However, if only an inch of cue stick is perfectly atop the shot line, atop the thumb/forefinger channel, as in my photo above . . . of course, the entire cue stick is on the shot line. Stroke!
Kind of my point though........One would assume then after bridge hand placement......one then needs to then use the inch of shaft to "verify" the cue is straight on the shot line....
It is widely regarded in shooting that a longer barrel is much more accurate and easy to aim than a shorter barrel.....so why not use the whole cue on the shot line?????......With different size shapes configurations and dexterity of hands....a bridge can be placed many different ways under a straight shaft and execute the shot.....but a perfectly v shaped bridge hand can still end up with a crooked cue (without verifying straightness of cue).
If the cue is straight you don't need to "verify" the bridge hand.....So why introduce a "variable" (bridge hand placement) that IMO is not necessary........place the cue straight on the shot line and let the bridge lay naturally under the cue to support it in the correct location.
I think better instruction time would be spent on bridge hand configuration as it relates to "accuracy" of delivery.....not alignment......As an instructor that is the type of thing I would focus on with a student......JMO