Any such "kit" would need its own approval, as it would be its own SKU.If the individual tobacco components are on the pre-2007 list, I wonder if blenders could sell "kits" to make your own batch of a discontinued blend. Obviously, not a solution for everything, but it could be fun, with a bit of a thumbing-of-the-nose thrown in. You get separate blending components, in the right ratios. Mix it up, jar it to rest for the required time, and there you go.
Any such "kit" would need its own approval, as it would be its own SKU.
You could buy bulk components based on a posted recipe, though. But a "kit" would be an application.