I've also used the plastic material that is used for kitchen cuttting boards. For just 5 euro/usd you get an A4 size piece of plastic, that allows for making all kinds of tools. I've shaped a few wedges from it, allowing for window trim removal, gutter trim, panel clips unclipping etc.
The wheel lug tool indeed has a little hook; see attached pics of my refresh process (I think they are originally nickel plated, so i redid mine that way, it came out near perfect. ) I've seen two versions of the hook; min is about 5 cm/2 inches. i've also seen versions with a short 2,5 cm/1 inch hook. I don't know what is original / year/ model. It may have to do with the difference in your rings.