Implement cToken sweepToken and return accidentally sent funds

Coinbase have responded and advised that there is nothing they can do. However, if they end up supporting CETH it will solve the problem. They won’t confirm or deny whether or not CETH is on their roadmap. They just keep directing me back to this blog post:

Would anyone here know if there are any initiatives underway at Compound to get CETH supported by Coinbase?

Appreciate any feedback or insights.