Hi, I was looking to find if Trezor will support Bitcoin Gold, as there are different sources claiming differing opinions, but I just finalized the operation with Bitcoin and Bitcoin Cash with Electrum so I may be able to help you out on this a bit unrelated topic.

I assume in the explanation below your bitcoins are in Electrum, before the fork. It is extremely important you follow the sequence below and not start one step before completing the other.

1. Open a new wallet for Bitcoins. I used Trezor but it can be any wallet. Do this on a different computer.
2. Transfer your bitcoins from Electrum to the the new wallet. (Your Electrum wallet is now empty.)
3. Open a new wallet for Bitcoins cash. I used Trezor for that as well, but it can be any wallet. But NOT Electrum cash. Do this on another computer (it may be the same as you installed your new wallet on in step 1).
4. Install Electrum Cash on your old computer. (It is now called Electron Cash.) Use the same seed (words) as for your Electrum wallet. If you install it on your previous computer (where you held the Bitcoins before the fork) it will find the seed words itself and you only need your password, in case you did not complete 100% erase Electrum manually. It shows something like unconfirmed or 0 something like that. Don't panic, your bitcoins cash is still there.
5. Now transfer the Bitcoins Cash from the Electrum Cash wallet to the new wallet. The Bitcoin Cash will show up in your new wallet.

Now you have both BTC as Bitcoin Cash