Hey, John.
I have another option for you. IMHO, a better one at that. If your worried about damaging the lens (which would be quite hard to do anyway), or scratching the lens, you can get what's called a "crystal photon 3".
Now, don't confuse this with the "ravin' party light" photon. The "crystal" model is the same as a covert, but with a CLEAR protective sleeve (as opposed to the black one in the "covert").
So, you have a sleeve to protect the lens, but not one that will block the peripherial light. The best of both worlds!
There is one difficulty, though. Most of the vendors that sell the photon at a discount don't carry this model. I've tried all on Brock's list, but to no avail. Some vendors say they don't carry it, others confuse it with the "ravin' party light", but don't get confused.
I ended up buying it straight from the Photon website (which is where I found out about it's existence to begin with). A bit high priced, but hey, no one else had it! Although after using it about 6 months, I think you'll be fine just buying a regular Photon 3.
Hope the info helps.