you did the BCH sweep wallet using your still visible and current BTC pre-fork addresses, it appeared to work, and yet you can't see any BCH in your Coinomi wallet. Right?
Correct. Everything seems to work, nothing happens weird on any software, be it the electrum wallet or coinomi. Only, no BCH shows up anywhere.
I think I'll just take the electron cash route soon. Moving coins to a safe wallet, then importing the electrum seed to electron cash. Seems to be the most reliable way, even though I wanted to stay away from Electron cash if possible.