You can lash anything straight to the bumper if you like...but.......i think you will find it may look a bit funny.....
AFAIK the bottom of the
Cupra R bumper is a totally different shape to a standard bumper....they are wider for a start....
see if you can find a picture of the front of an R and compare to your car....it think the curvature is different.............
why not get the whole bumper.....would look ACE!!!