I have personally seen some variations on this guy wire theme.
Let us suppose, for example that you get a buttonhook dish, and it's there pointing straight up on your front lawn. On the edge of the dish, you put three or four machine screw holes in there, and you attach them with washers and quarter inch pieces of tubing, so that one of those teardrop shaped wire rope thimbles fits around the tubing and under the washer. Then suppose you used sixteenth thick stranded cable and those little cable clamps, all available at your local big box hardware store.
Assuming the buttonhook is reasonably close to center, you could adjust it merely by pulling the loose end through the clamp, holding and then tightening. Then, if you have to take the buttonhook off to install, all you would have to do is to tag each cable and post so you don't mix them up.
My first big dish was dropped and bent, and I used this method to hold it round, That was a whole lot more pressure than you would encounter with a buttonhook. So just some sixteenth inch wire rope (Home Depot) thimbles and cable clamps, 3/16 screws, nuts and washers. All at HD on the same aisle.