I can only speak from my experience of having the camera mounted behind the screen. As I am not Steven Spielberg and I am only after recording footage in case of 'incidents' or my own consumption then the quality is absolutely fine. Keeping the screen clean or keeping the lens clean is the same and the target area for said bug splats is almost identical. I have used Rain-X on the lens of the camera as well as on the screen, there is a specific formulation of Rain-X for composites.
That is fine; each to their own. However, I was parting from the premise that GoPro cameras and their ilk are
action cameras largely wasted (even in Aldi spec but ESPECIALLY so in real spec) as dashcams for the purposes of incident recording. In the case of the
real deal you are placing a soon to be opaque and inferior transparent surface with a great deal of distortion in front of a highly polished and near perfect lens thus rendering it, effectively, as if it had been made of shitty perspex, akin, perhaps, to plasticising a diamond to protect it.
Even in Aldi spec, it's still not a great buy for that because as you will soon discover, they aren't very reliable and that all important footage that you think you will have, won't be there. GoPro's are designed to be robust and shockproof and to take a hell of a beating; Aldi specials are cheap cameras inside a GoPro housing.
Ask me how I know.
In any case, as I say, there are much better solutions for what you want. MIO and Nexbase offer much better options at a reasonable enough price.
Lastly, have you actually looked at the footage you have recorded much? Can you actually see anything of any value in the right of the screen when you play it back? I notice you have it on the left of your bike. Not all incidents are head on or from the left.
Just my tuppence worth. I think you should do whatever you think is best. I just wanted to point out to others who might be thinking of doing the same thing that there are other solutions if what they really want is to use an action camera for what it is designed for. And that if they want a dashcam, a GoPro behind a perspex screen is a bit of a waste.
Lastly, an Aldi special is probably more suited as a helmet cam because the vibrations (which are what ultimately separates the wheat from the chafe) are what ultimately kills them and makes them malfunction, You don't get any (vibration) on a helmet but you are then limited by it's battery. Even a GoPro has it's limits so it might suffer premature failure if you stick it onto a S1000XR handlebar, for instance.
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