Thats what I'm planning for my rig, 4 point, that is. I don't think your need the crotch strap.
A problem might be getting the shoulder straps to stay in place.
1979 CJ7 (YJ tub) full cage, Currie 9inch rear with Warn full float kit, detroit locker, 456 gears both ends, Lockrite in front, T 18 trans, 360, 040 over, Isky cam, 2 into 1 Flowmaster exhaust
I'm not as good as I once was....but I'm good once as I ever was.