Exchanging BCH to BTC
You can exchange your BCH for BTC and multiply your wealth by 1.075 (at the time of writing).
Send your BTC to a new key/wallet.
Download and boot Tails
mkdir -p /home/amnesia/.electrum/wallets
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Restore your old wallet from key/seed (i.e., the wallet that has now zero BTC balance, as you have sent out the coins in the first step) to Electron.
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Click “Account → BCC → Fund”, send coins from Electron to the generated address.
Wait 2 blocks.
Click “Transfer Main → Trading”.
On “Exchange” tab select “Instruments” box and select BCC
In “Sell BCC” box on “Market” tab click on “Balance” and then the big red button.
Wait a few seconds.
Now you have BTC.
On “Accounts” tab select “Transfer Trading → Main”
Select Withdraw, enter your BTC address. Wait a few blocks.
Exchanging BTG
This was not tested.
WS charges 10 % processing fees. Unless you are a Bitcoin millionaire, paying 10 % is probably worth the convenience.
WS claim they support multisig wallets too.