I use the focusrite interface for my mic but when i’m using the focusrite USB ASIO drivers i can’t use my headset as an output device, as it can’t plug into the interface. Is there any way i can use both at once?
You can, using an ASIO driver that can address 2 audio interface simultaneously.
If you’re on Windows, try ASIO4all.
But the short and sweet answer for anyone not yet in your position is: don’t buy a USB headset 