looks like a good head to practice on. I also use an angle grinder with a wire wheel. you can mount a wire wheel on any angle grinder - you just have to find one to fit. your grinder should be something like 4" or 4 1/2" - depending on the wire wheel type you may need to remove the little bushing(s) that you would use with a cutoff or grinding wheel.
I'm only opposed to vinegar because of the smell. I use evaporust occasionally, which does the same thing, but doesn't smell. it WILL remove all rust,that's for sure, but it does leave a dull gray appearance to the steel. The wire wheel doesn't remove ALL of the rust - but it removes most of it and creates a patina with some of the rust, that looks pretty good if you oil up the head right after you are done, makes kind of a black finish to the steel. I mostly use evaporust anymore on things that are too small to wire wheel.