Jeff Maybe I'm not understanding your use case.
If you have one single charge window from 00:00 - 07:00, and within that you have several charge slots (auto)selected, the hold charge will indeed keep the battery charge at the level it is in between the charge slots.
You seem to suggest you want to hold the charge during the charge slots? Not charging but hold charge? So you don't want to charge?
Unless you mean you don't want it to hold during the unselected (and more expensive slots in your agile charge window), in which case, you just turn Hold Charge to off. Which will then use the battery during the more expensive Agile charge slots.