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a60fb26
(Get the code!)
This would have to be pretty restrictive, I think. PD kind of gets away with it because there is a mechanism for disseminating the new subnet to hosts on the subnet in IPv6 router advertisements.
IPv4 really doesn't have a good mechanism. DHCP would be terrible for this. You'd have a long period of time where you would need to expect things to just not work as all the various ports on the subnet are updated through DHCP and RPC (router ports, DHCP server ports, etc). There is no way that I'm aware of to reliably trigger a forced update to DHCP clients.
So, this would have to be restricted to IPv6 subnets where RA is used to be viable at all. Even then, what's the point? You can always add a second IPv6 subnet to the network and then delete the first one. Have you tried that to satisfy your use case?
I'm going to mark this incomplete until a good use case is described.