Keystone: Errors with syncMaster strategy in hardened delivery instance

If you are using Keystone 4.6 or earlier, you may receive this index-related error message after hardening the Sitecore content delivery instance:

Could not find configuration node: contentSearch/indexConfigurations/indexUpdateStrategies/syncMaster

Even if you have followed the SwitchMasterToWeb workarounds from Sitecore’s KB article, the error will not be fully resolved as the standard SwitchMasterToWeb does not contain any references to the Keystone indexes.
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