Looking at the installation guide for that camera, I don't imagine it would be hard to rig your own adapter... and since it IS an IP camera, I don't see how that would have any effect on image quality (unless I'm really missing something). As far as I can see, all you need to have it do is connect pins 1-3 and 6 on the RJ-45 to the appropriate pins on the M12 connector... PoE should work as long as your source supports PoE Mode A, where power is carried on the data pins.
The trickiest part to me would be getting your hands on the right connector, but you should be able to just take the end of your UTP run and wire it straight to the connector and be good to go... in fact, if the camera's connector is female, you could probably strip back the wire ends and just push them in (REALLY ghetto and not recommended for a production environment).