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In order to replace the data source, we need to establish the connection to both the data sources. If the connection is successful and there must be a viz is created with the data source which is going to be replaced with. Otherwise, the option will be disabled.
That option will be enabled only if there is a viz created.
For more information, check the Tableau Online Help article on Replace Data Source.
Unfortunately, my bridge data source no longer exists (my IT team could not establish a safe and stable virtual machine on our server on which to maintain it). I can't establish a connection to the old data source now
So I guess there is no way to do it?