DataGroup Item - is there a way to define color in 3D model without creating another part

Is there a way to have for example a DataGroup Item 'Brick wall' which gives me the option to chose a width when placing, that shows the ones that are 9cm dfferent then those that are 14cm in my 3D model.

I can only think about making a second part, but that would also create the need to make 2 DataGroup Items, to be able to link them both to a different part. Which seems a bit overkill just to have this visual difference in my 3D presentation?

Any ideas?