@mxm thanks for taking this up!

I used the changes in this PR to illustrate what I would like to accomplish as 
custom extension here: 
https://github.com/tweise/beam/commits/processJobBundleFactory

My goal is to launch the Python SDK harness directly (eliminating boot.go), 
artifact staging can be skipped.

>From cursory test it seems error handling in the process launch needs some 
>fixing. We also need the ability to propagate the environment of the JVM plus 
>set additional environment variables to meet the contract of the Python worker.


[ Full content available at: https://github.com/apache/beam/pull/6287 ]
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