AWS IAM inline policy for a user that gives them access to a specific region. Definitely not complete but good enough for me, for now for dev.

region-policy.txt

I'm no expert here so there may be better ways, but this attempts to give a user complete access to a specific region only.  

The first statement covers all resources with ARNs that have the region included.  (Everything except S3 and IAM?)

And the second statement specifically handles s3 and gives complete access to all buckets that end in the target region.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "*",
            "Resource": "*",
            "Condition": {
                "StringLike": {
                    "aws:SourceArn": "arn:aws:*:us-west-2:*"
                }
            }
        },
        {
            "Effect": "Allow",
            "Action": "s3:*",
            "Resource": [
                "arn:aws:s3:::*-us-west-2",
                "arn:aws:s3:::*-us-west-2/*"
            ]
        }
    ]
}

quick update. this doesn't seem to be completely working after all