That can work but it’s not ideal because you will be using both the sound blaster and the UR22 at the same time. This isn’t possible with most drivers, but with ASIO4all you can do this. It’s not ideal, but worth a shot (Asio4all is free). If it isn’t what you want you can always decide to buy monitors later.
I have no experience with running Guitar rig standalone so someone who knows might have something to say about that too.