Based on my research, Download Bither and BitPie from App Store / Google Play. Create a wallet and click the cog -> advanced -> HDM account recovery. Scan qr code or enter the seed of your bitcoin wallet. Let it sync and your fork balances will show up. Go to advanced -> get BCD/SBTC/BTG/BCH. Send your forks to the BitPie wallet. Send your forks from BitPie wallet to exchange.
I did it like that importing my old trezor seed but I could only claim a few coins from my legacy accounts. that's a pity as most of my coins did were on a segwit adress during the snapshots.