It took me a while to figure this out last night.
Download bluestacks emulator for android apps on Windows.
Download bither + bitpie.
Sweep all your bitcoin into another trezor or similar wallet before this step:
1) import your (now empty) seed into bither unnder hdm account recovery
https://imgur.com/a/YH1Cq it then syncs and shows you balance of BCD and SBTC and also BTW (wtf is that?)
2) Simply click get BCD (it then asks you for a bitpie bcd address, I tried sending direct to an exchange but it didn't work
3) send to bitpie, then exchange
cash out.
Same can be done for SBTC.
I cashed mine out last night and made an extra few bitcoins, pretty easily. I came across a dozen scam websites/fake wallets asking for mnemonics and so on before this so figured people could do with an easy solution.
Hope this helps