Turtle Power is the first thing that came to mind when I saw this set. I had to do a web search for Jim Clark and the WDC because I'm not a race fan, although I do admire the design and engineering that goes into producing machines. Maybe if you could change the color layout to incorporate something like Regack's keyset as seen below, it would differentiate your set more.
Here's the "big" one next to the WASD Code:
Show Image
Although, that would limit your options for what type of boards you could put the set on and limit its appeal to a smaller set of buyers.
I played around with the layout you provided. My result is not great but I think the addition of a checkered flag to the number pad could be a nice touch for your set.
http://www.keyboard-layout-editor.com/#/layouts/da6ef7c893f0018a53e215a1afc58152I see chrome and white and black on Jim Clark's F1. Maybe you could try incorporating those colors into the set too. I tried making the modifiers silver (hex value BFBFBF) but I don't think it was an improvement.
I think a WDC trophy legend would be a good choice for the OS key.
After looking at the vehicle, I can see potential for this set but I am guessing that the number of mechanical keyboard enthusiasts who are also fans of F1 and who are also fans of Jim Clark is pretty small, so your set is going to have to appeal to a wider group than just F1 fans.
edit: I realized my wording was a little ambiguous and changed it to be more clear.