The Formica I have seen was thin and flimsy and would not work as a pressure strip.. The galvanized metal pressure strips I got from Binghams are aprox 0.035 inch thick and are cut to standard lamination width sizes, I have 1 3/4" and 1 1/2" wide strips. I put paste wax on them before each use for easy clean up and have had no problems with them. I know some guys use 1/16" or 1/8" thick aluminum strips for pressure strips.
If you plan on making several bows then a nice plywood form would be worth your time, money and effort. Maybe someone near you has one you can borrow??