The only way I can think of to make it easier to display dynamic content is by using PHP in your views. Analyze the URL or the filters being used and then include()
a text file containing the unique content.
This code is right: [DFR:category?c=800604&brand=callaway]
But it's probably not working because the merchant has not included the product's brand name in their data feed. So, you could do this: [DFR:category?c=800604&word=callaway]. In most cases, that will give you the desired effect.