I think you can already get that type of light. It would probably use a tiny little 400 lumen led, I can’t remember the name, and create an extremely focused little hot spot. Or you could build an aspheric thrower. The Lance of Ra is 2.6mcd. Again, tiny little focused hot spot so these are not like a practical everyday use type of light. They are quite specialized.
The GT already falls into a small market segment with its super long distance. A 2mcd light would be in an even smaller market segment. I know I am not interested in such a light.
But no, I gave not heard of such a blf project.
Btw, here is a list of the longest throwing flashlights.
Maxabeam, 52mcd, wow.