I’m not a windows specialist but I think you can add the OPENPYPE_MONGO variable in a GPO. This link may be able to help you to put a variable by a GPO:
https://social.technet.microsoft.com/wiki/contents/articles/25972.create-environment-variables-with-group-policy.aspx
and that of the openpype doc for the OPENPYPE_MONGO variable:
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