I own several basses and dozens of straps. I've done fender washers for years. Somehow, I don't have any of these problems.
...and I'm not adding $40 or so to the cost of every strap I want to be usable.
You own "dozens" of straps and several basses and you need to whip out a screwdriver every time you want to change a strap? Surely you are joking! How many button screw holes have you stripped out?
Where do you get $40? It's just $15 or so for each bass and strap combined or if there are extra straps or basses you can get the lock parts separately cheaper.
Now if you said that you don't use Dunlops because they sometimes don't fully lock for you, or Schallers because sometimes the nut unscrews itself off them and in either case the bass still can drop, then I'd say, sure that makes sense. But when you say you WANT to take your straps on and off with a screwdriver to save a couple bucks... ???
k bye.