I think the variety name doesn't really matter all that much. From what I understand the anthocyanin is, in a way, easy to breed for because seeds that carry it are visually identifiable. I may be mistake but within a kernel, it is primarily associated with the aleurone layer. The thin layer of cells just under the pericarp.
So it's easy to see that a kernel has it, so long as the pericarp isn't too dark or the color of a translucent pericarp isn't combining with the color of the aleurone to produce a false anthocyanin appearance. That is, it looks purple
enough but the purple color isn't actually associated with anthocyanin. One way to test for that would be use a small file to cut through the pericarp (in a spot that doesn't damage the germ) to reveal the true aleurone color.
Ok, I said I think it's fairly easy to identify an anthocyanin kernel but I have no clue how that anthocyanin is inherited. Is it dominant? If it is that's not good because a purple kernel could also be carrying a recessive counterpart. Maybe it's recessive, that's great because then you know both genes are the ones you want.
But, is there only one set of genes involved or a combination of genes? How do they interact? Is the anthocyanin trait there or not, or is it quantitive, existing in varied degrees?
To me that's where Dave Christensen comes in. From what I understand he worked for a very long time developing Painted Mountain and since has been working to isolate a high anthocyanin, purple corn from it. Anyone could grow some Painted Mountain and pick out some purple kernels to plant. Those kernels would probably produce some purple ears but I doubt it would be universally so, nor in the following generation.
My climate isn't suited to flour corn so I can't grow it but if I was in the market I'd wait for the Christensen seeds.