[Sprint HTC Arrive]
Only if you have a .dev or dreamspark account that will allow you to sideload xaps. It is possible that ansar or another GoldC rom creator could add the cert from another party that would then allow interop unlock from Heathcliff. I don't believe there's any other possibility at this point.
The GoldC unlock isn't taking any priority & last I heard DFT doesn't even have one to work on. However, it does appear that many are looking for what would result in an across the board unlock/root method.