Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/17982
  
    Yeah, this was always a bit of a hack as this isn't an API. 
`createInterpreter` sounds like a promising place to hook into for now as it 
exists across these versions, and would mean Spark is initted a little earlier, 
before instead of after this middle block in here:
    
    ```
      def process(settings: Settings): Boolean = savingContextLoader {
        this.settings = settings
        createInterpreter()
    
        // sets in to some kind of reader depending on environmental cues
        in = in0.fold(chooseReader(settings))(r => SimpleReader(r, out, 
interactive = true))
        globalFuture = future {
          intp.initializeSynchronous()
          loopPostInit()
          !intp.reporter.hasErrors
        }
        loadFiles(settings)
        printWelcome()
    ...
    ```


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