Short answer; No. Using something like a signalink or Digirig makes things a lot simpler and at that point you don't need a CT-17 or equivalent interface.
Long version:
The CT-17 can only control the radio , it doesn't do anyting with audio.
So if it's the interface is an accurate copy of the CT-17, in order to do FT-8 or any other "digital mode" that requires audio,you'll still need to take care of that in addition to using the interface for controlling the radio.
You could take audio from the radio and feed it to the computer and also take audio from the computer and feed it to the radio without an interface, just using the right jacks/plugs/connectors.
Using something like a signalink or Digirig makes things a lot simpler and at that point you don't need a CT-17 or equivalent interface.
Dimitri