I lacked Sting bris at the time I mained champ and I believe the only problem is it's kinda hard to get IC without outside buffs.
Kiels would make reaching IC even harder but as long as you don't mind eating food or getting some gear that adds a bit more dex. . . it should be fine.
Sting Bris would probably be more convenient than celebs in the long run, however, you could try a cast reduction setup. I had a friend a while ago who ran a build like that and it worked pretty well in all fields, especially when it came to Asura builds since you could stack more int and str rather than worrying so much about dex.
If I ever went back to Champ that's probably what I would do.
The gear would be similar to what SukiChii already mentioned, just swap out the sting and add cast redux. (beezle)
