Roadmap: you said “ It looks like the python sdk currently does not support images from an external private registry.” when will the sdk support private registries?

I am not sure if the sdk will ever support this. You have to open an issue in the python sagemaker sdk. Since this is not related to the HF extension.

If I forked the HF registry, I would think it would be just a matter of adding the vpc parameters to the HF code as a pass-through to AWS. does this sound right to you?

You also need to create the lambda function as shown in the documentation