In researching how to do this I came across akka.stream.io.OutputStreamSink 
which is exactly what I 
need: 
https://github.com/akka/akka/blob/releasing-akka-stream-and-http-experimental-1.0-RC3/akka-stream/src/main/scala/akka/stream/io/OutputStreamSink.scala

The code snippet is very simple:

val outputStream: () => OutputStream = { () => {
 val pipedOutputStream = new PipedOutputStream()
 //do something with the piped output stream, like connect it to a read 
stream

 //return for later
 pipedOutputStream
}

//somewhere else, maybe in a route:
akkaHttpRequest.entity.getDataBytes.runWith(OutputStreamSink(outputStream), 
flow)

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