How to transfer Bitcoin Cash from a multi-sig vault? I have two private keys for a multi-sig vault. I have a tool that will sign transactions to move BTC out of this address.

Where can I find a tool that will use my two private keys to move BCC (Bitcoin Cash) out of this address? I want to move this BCC to an exchange for trading.

For the curious: this multi-sig vault was created via coinbase. And while their official position is that they don't give users access to their BCC, since I have control of two private keys I can move BTC out without their cooperation, so I should be able to do the same with BCC in that same address. Coinbase's own tool only works with BTC, so perhaps a fork of it that works with BCC would be ideal.
After a long, painstaking process, I developed the manual steps required and thoroughly documented it here:

How to sell your Coinbase Multi-sig wallet coins on the Bitcoin Cash (BCC) network