[Python] How to point Conda at a specific, non-standard, pre-existing python installation

I feel like I am asking for a hack, but I want to be sure before I look into other options.

I am trying to use conda to build, repeatable environments on a given user's machine. For most uses everything works fine, however, when working with game engines or DCCs (digital content creation tools, maya, blender, unreal) they often come with their own installation of python that is compiled with their own packages/apis/etc. These custom versions are compiled against a standard version of python, but they only can be installed as a part of the main application. They do have a standardized location in the install folder so finding it is not a problem and they can be run independently of the associated application.

Ideally I could provide a standard env file and feed in the local python exe and version via a bat file or something. That said, I am open to all ideas.

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