Well in my opinion the bumper will fail, the metal is very thin. I bought aftermarket bumpers that look like warn bumpers on ebay ,front and rear for $350. My bumpers are 50 times stronger than stock. I have been yanked out and yanked several people out many times and no problems. I would spend a few $ on new bumpers or just use the tow hooks you already have and by the way it takes a lot less time to put a tow strap on a tow hook then is does to put one on a clevis.
good luck Mitch