I'm going to seek out a paper punch tomorrow as close to the diameter of the lens as possible. I have a spare Best Skins Ever lens protector which fits perfectly that I am going to bring with me. Once I find the punch I'll be able to crank out EVO camera lens protectors like a factory.
I actually found a perfect size punch and cut out a lifetime supply for myself. I found through experimentation that the static type protectors are not the best for this application. I turns out that the protectors I cut were sized so exactly to the lens assembly including the outer metal ring that the static type would not sit flush on the surface and there was always an air bubble beneath them. The solution was to use the type that adheres using a liquid solution. I had a 2 pack of Phantom Skinz clear screen protectors which use this attachment method so I proceeded to cut out as many lens protectors as I could from these. The lens protectors fit perfect and stay firmly attached to the lens surface.
Here is what I found over the last 2 days of experimentation:
Static type protector: (Steinheil, Seidio, Boxwave, etc)
1. Unless you cut it smaller than the lens assembly it won't sit flush on the lens. I wanted the whole assembly protected including the metal outer ring so this was a deal breaker for me already.
2. When placing it on the lens it's a one shot deal, they can't be slid around to position them. You have to peel it off to reposition it which introduces the possibility of getting fingerprints or dust particles on the adhesive side.
3. Once the protective film is taken off the adhesive side it's a battle to handle that tiny piece without getting fingerprints on the adhesive side.
4. More likely to peel off if you snag the edge.
Liquid type protector (Phantom SKinz, Best Skins Ever)
1. Doesn't need to be cut smaller than the lens assembly it will sit flush on the lens and the metal outer ring.
2. When placing it on the lens it's not a one shot deal, it can be slid around to position it due to the liquid.
3. Once the protective film is taken off the adhesive side fingerprints are not a huge issue also due to the liquid providing a barrier.
4. Much less likely to peel off if you snag the edge, the adhesive seems to be strong yet leaves no residue when removed.
5. I tried both Phantom Skinz and Best SKins Ever. They both have all the properties I listed in #1-#4 above but I found Phantom Skinz to have less of an orange peel texture but they were just about equally clear.
Note when using the liquid type protector: Use as little liquid as humanly possible! I know Best Skins Ever includes a camera protector with their back skin but just be super careful with liquid near your phone. I used only enough to attach it and have it slide, there was NO EXCESS dripping off the lens area at all.
I will accept no responsibility for damaged phones! Proceed at your own risk! You have been warned!