Well truthfully, I would try and incorporate some kind of pellet in there. I have wild bettas so they may be different, but when I did have domesticated splendens and put them on a similar diet, they never looked as good as when I put them back onto pellets.
I think you would be looking at feeding a very wide variety of live/frozen foods if you tried to make a diet like that work. So not just frozen bloodworms and brine shrimp, but things like blackworms, white worms, mosquito larvae, wingless fruit flies (never tried them myself). I know using probiotics in live food cultures have become more popular, and maybe gut-feeding live foods on fish pellets may help pass some of the nutrients along to your betta.