I tested this for several locations. This only works as expected if you don't implement switch config templates. When you unbind a network from a configuration template (and retain configurations), configuration overrides are preserved at that point, yes. However, in the case of a combined network, any switches joined to that network are also unbound from the switch config templates they were assigned to. If any switches are then re-bound to a switch template, (even if it is identical to the original one it was attached to), configuration overrides are deleted at that point. So if you don't use switch config templates, this works. If you do use switch templates, config overrides are removed once you bind switches to a switch template. The only way around this I can think of, is splitting the network into separate wireless and switch networks, updating the Wireless template, then combining the templates again into a combined network.
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