IPv6 General Prefix

thanks a lot LAZ,
i will do a lab to test the EEM solution (and if i succeed i will do a post)
I accept also the solution with device programmability although i need to dive deeper in network programmability to config this type of solution

But for DHCPv6 and prefix delegation, it is not quite clear; suppose the ISP has to change the binding of just one customer
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It has to change C1’s binding with a given value for some reason; for example 1100 has to be replaced with 1109. No change for C2.

How can the ISP do this at a specific time ? assuming the customer has nothing to do to get the new prefix at this specific time.
This will be beautiful feature, but not quite sure it is possible ?
Regards