I am aware that this is an old post, but just to post my reflection if somebody get stuck.

I tried using bither but was unable to select currencies, I was only able to select BTC.

So, I attempted with BITPIE and succeeded.
However as of 21st of February 2021, ios app had a bug which crashed the app whenever you tried adding private keys.

So, I have installed emulator for android and downloaded Bitpie there.

From there, after you create wallet, go to "Me" section -> Setting -> Import your asset and you should be able to handle it from there.

Thanks for the great article olsm, three years later this still points people into right direction