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After thinking about it for some time and doing some experiments I decided unregistering a node is a bad idea in my case (it seems you can create quite a lot of trouble if a node is not available because for example the network is down for a second).

What I found to be a great alternative without a brute force approach is node_alive package that allows me to keep track of nodes that are see as alive. Then I can use this information to keep track of 'pingable' nodes and use them accordingly in my setup.