buying cobalt, rubicund, xanthous cells, forbidden keys in quantity of 99

I spend a lot of time farming VWNM for empyrean trials to get heavy metal plates. One pain point (other than the time to collect 1500 plates) is that the rubicund, cobalt and xanthous cells can only be bought in increments of 12. I usually buy 99 at a time and it's very time consuming to buy 99 (by 12 at a time) of each to support farming. Can you add 99 as a quantity that we can buy from a voidwatch officer? The same is true about forbidden keys in Abyssea, you can only buy in quantities of 50 and not 99.