I haven't found a flashable zip for HTC's camera, trust me...I looked. However the MIUI camera was shown to me, because I also wanted a full screen camera on AOSP. It's not as feature rich as HTC's, but it does the job just fine. Here's a link for the camera zip. Just flash as normal, no wiping required. Hope this helps.
That's what I was thinking, just wanted to make sure. Sadly, the MIUI camera DOES NOT swtich to the front camera. You'll still have to use the built in camera for that. Though, I haven't found it to be much of a hassle....since I usually don't use the front one.