For goodness sake, use the book!
All very well and good if there is a book. Thankfully not all of us have to fly Piper Arrows.
As for applying flap during the takeoff roll, you are asking for trouble. One day you will either forget because you are dealing with some other problem, or something will occur just as you reach down for the switch or the bar. I've already nearly been killed by a sticky Cessna flap switch and I don't take my eyes off the runway just to check if the flaps are extending. Things can happen very fast and you don't need to add unnecessarily to your own workload pulling this trick. The gravel strips I've used require all your attention just to keep the aircraft pointing in the right direction and on "centreline"
Let's face it, ace, you've already confessed to putting one in aeroplane in hospital, perhaps you are not the next Chuck Yeager and might be better off finding a less challenging hobby, may I suggest cross-stitch?
Neck-winding-in mechanism obviously an optional extra for you?
Stik