Proposals that formally modify the topology of a subnet should be performed or guided by those that are able to do so in a way that does not violate the formally voted in target topology (motion proposal). I agree.
Im afraid I’m too busy today to assist with this until later this evening. In the meantime I highlighted what I consider to be four appropriate replacement nodes in this post → Subnet Management - 4zbus (Application) - #13 by Lorimer (scratch that, wrong context)
If you’re unsure of how to modify the subnet topology for the best, I would reach out to DFINITY for a hand, and/or review unassigned nodes for an appropiate replacement.