…Choosing the time unit occupants use higher load appliances is limited…
This is the bit that worries me about sharing any electricity tariff with different rates at different times. What happens if some are very diligent about shifting loads to times of lower cost while other can’t be bothered? Would it lead to discord? Is there a mechanism for equitable cost sharing? On a flat tariff it is easy. A simple kWh counter in line with each unit allows for pro rata sharing.
BTW. EV charging and water heating are substantial loads that can usually be shifted fairly easily.