BTG is gettin a little pump. .02 now on bittrex. I'm dreaming of .05
Speaking of, is there a reliable way to extract them from old coins?Coinomi app wallet is 0retty simple and secure, if you move your btc first.
It You need to recover from seed use bither app. You can also claim bcd and sbtc with it.
If you have problems pm me and I will be glad to help you

Edit: if your old private keys didn't worked in coinomi, your problem is probably related to compressed/uncompressed format, you can convert the format using bitaddress.org.
During the early fork days I helped out a lot of people, I become some kind of expert xd
Are they unencrypted?
If Yes, just click "wallet details" in bitaddress.org (better use it offline, the github source for download is linked on the site itself) and use their tool to convert them

EDIT: Before messing with this, try the other import priv key (not bip38) option!
Not your Electrum wallet password but the Bither password.
If you have nothing in Bither, uninstall, reinstall and remember your password this time. It works.