Anyone had this done, without replacing the front bumper?

Not sure about the stock grill but search for SuperSkoda replacement grill in the forum and you should get your answer.  There are some on here who have done that seemingly without much issue (other than the bumper needs removing first)

Yes....

I had my grille replaced after to pigeons crash in to it...

After Skoda told me £1000 to repair it..

I found a grille on Ebay for £130 and got a mates brother who owns a crash repairs to drop the bumper down 

& re-glue grille in .. he charge me £150.. You wouldn't know its been change..