The saw horses were just convenient for the photo but I have used them to draw wire. Usually I clamp the 2x6 to my workbench (not my jewelry bench) with a “C” clamp. Heavier duty saw horses than the ones pictured should work fine but you probably need to clamp the drawbench to one of them. Actually, your kitchen table or countertop would work. Mostly, you just want the drawbench to stay put while you turn the crank.
The eye bolt is just a standard 5/16-18 eye bolt from the hardware store but you need to check your locking plier for the proper thread. I’ve probably had that ViceGrip for more than 60 years (USA made/SAE thread.)
The aluminum angle you mention would probably work… easy enough to try it. You could use two pieces of angle to form a Tee with the center (vertical) leg of the tee being the doubled one. If using a single piece of 2" x 2" x 1/8" angle place the drawplate so that the hole you are drawing through is down (near the corner of the angle.)
You can use a spring clamp or even a large binder clip to hold the plate to the angle. No tension there. You just want to keep the plate from falling to the floor after every pull.