That’s definitely a neat idea but i I’m honest I’ve never been a fan of the additional storage although appreciate it’s useful for those travelling and not in a fixed location. For most though it’s easier just to keep one of your 2 pouches and scoops at work.
For me things like the below are cumbersome and clunky. Have you ever held 750ml shaker with a clip on powder container? It’s like holding an artillery round. If we were to do something like a custom shaker then it would be focused on making it less masculine and bulky as opposed to adding more gadgets to it