[Python] Adding a custom CA Root certificate to GCloud utility (or Python generally) on Windows

I'm using gcloud on Windows to develop GAE stuff. The network here has a MITM root certificate by design so all SSL traffic can be snooped; I can install the root cert easily into a browser or Windows certificate store, but can't successfully get this work for Python, or more specifically, gcloud (which has its own Python bundled). The answers at How to add a custom CA Root certificate to the CA Store used by Python in Windows? don't work - I've tried setting SSL_CERT_DIR and SSL_CERT_FILE environment variables to no avail, and the pip.ini solution isn't applicable as I'm not using pip.

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