What I don't understand is why you would have trouble adjusting the turnbuckles with the implement raised off of the ground. You can easily push any heavy implement a bit sideways with one hand to get the bind off of the turnbuckles, you can adjust with one hand. You weren't trying to adjust them while the implement was on the ground and in a bind were you? Yes turnbuckles are slow to adjust, and the telescoping stabilizers are much superior, but turnbuckles are not hard to adjust. If you have a hydrostatic transmission tractor you can leave it running at idle, and put your bucket down flat to keep it from drifting off, and if you need to pull up or back up a hair, just put your hand on the proper pedal to move it a tad.
Don't run over your foot though. With a gear drive tractor, you can use LeeJohn's method to curl/dump your bucket to move the tractor a bit.. I used to use that method when I ran gear drive tractors. I have never used or needed a prybar.