Frank,
I can only speak from my own experience, but I see one problem with your proposed solution. If you need to detach in a hurry you will not be able to. It is possible that if you go overboard the force of the current around the hull will force you underwater, a would be rescuer may or may not have the strength to pull you out against the current. With a quick release snap, you can detach yourself and save your life.
Here is a link to the type we use:
http://www.landfallnavigation.com/swt09.html
You'd attach the "yellow" end to the boats jackline, and the quick release end to yourself. BTW, tie to the windward side as a rule of thumb.
Some boats have specific points designed to attach jacklines, ours doesn't so we tie jacklines from bow
cleat to stern
cleat, one down either side of the boat. The disadvantage that gives us is the jackline runs a bit farther aft than I would recomend as an ideal solution.
One last point. there are specific
lines manufactured for use as jacklines. Although not necessary, their practical advantage is since they are flat, it is easier to walk on them and not trip., these are the ones I've seen:
http://www.landfallnavigation.com/wichardjack.html
I hope this reply makes sense.
Harry