I didn't know, till now, Cobra made any shields. I have the Rivco heat shields that came as a set of 6, with the bends as well.
I did just run across these which I assume are what you got:
The Rivco's had spring clips vs the hose clamps. I was able to clip them into place without removing the exhaust, although it may have been easier to do them off of the bike. The spring clips would probably have moved around when trying to re-install though unlike them clamps you got. I hate pulling them puppies.
I would think if you can get in there with an angled bit that you should be able to do it without removing.
Good luck.