EMC you mean EWC/earth worm castings?
Coco-ewc-rice hulls; good.
Not sure how i would use oyster shell flour here, since it's normally used with peat.
Neem, kelp, crab, shrimp, soybean...all good amendments, you just have to balance them. I mean...crab and shrimp are N-P-Ca rich.
You could do...