Dedicated Navigation key functionalities (4 ways scrolling and center select ) will not be available.
However following Qwerty layout will be available where basically arrow keys and Enter key can replace those functionalities. However it is up to the 3rd party application to decide how to utilize the Qwerty layout for the best possible usability.
Arrow keys are same as each direction of Dedicated Navigation key in scan code level (4 ways).
Enter key is mapped differently than Dedicated Navigation key center select. In Editing UI component, Enter key usually works as line feed. Otherwise it is up to each application how to implement Enter key response.