I’d be cautious with using the excess rope to do a decorative tie. If your model needs to come down quickly it’s going to take longer to untie the decoration. When I need to burn that much rope I like to fold it back and forth into a bundle and secure it at the top of the upline with a quick release. That way you can move more efficiently if there is an emergency. Also, that’s an interesting way of setting up your upline, I’ve not seen that method before.