Handling of "Audio Interface not present"

The workaround for macOS would be to create an aggregate device.

For Windows, you can use an ASIO device that uses your integrated sound chip, such as ASIO4ALL or FlexASIO.

Alternatively, if you need more input/output pins, you can use VB-Audio Matrix.

This can serve just for design purposes, until you connect your ASIO audio interface (in this example, the virtual device has 8 pins, but you can configure up to 128 pins).

The Routing is configured through a matrix (the Routing grid):

You must configure this part (route audio to the physical audio outputs) if you want to hear the sound from your speakers.