I don't mean to repeat myself but what happens if a user has bought the Overclock, then buys the "full" hypermode? It would either get wasted, or be pushed to after the HM
Honestly, i think the bigger "fix" would be having 6monthly/yearly discounts on the Overlocking.
I would imagine that if a user decided to do that then it would add 28 days to the overclocking and activate 28 days of the other hypermode benefits immediately, and whatever time was left on the previous overclocking would still be there after the hypermode ends if that makes sense.
I definitely think there should be 6 month / year discounts for the players that would use them. Pretty much every other ZC-purchased item has bulk discounts like that. This shouldn't be an exception