You can actually sweep your private key into Coinomi: https://coinomi.freshdesk.com/support/solutions/articles/29000013432-what-is-the-difference-between-importing-a-private-key-and-sweeping-a-wallet-

If you need LIVE support feel free to chat to our engineers using the pop up window on the bottom right corner of our website: www.coinomi.com they will point you towards the right direction, thank you.