Thinking about bazzle of the your Kospet Prime. I think it's perfect solution for you. 3d printable files are attached. You can print it by your 3d printer or 3rd party 3d printing service. It will not make your Kospet large, because wall thickness is 0.8mm only. It will fit and cover your smartwatch perfectly and easy to attach and dettach the cover.You will feel safe while you're working in outdoor. From my experiences, I got scratches on the ceramic bazzle while unconsciously bazzle touch the wall hardly. I don't need to think about the bazzle or camera window now. I used PET material and layer thickness 0.1mm. At the 0.2mm layer thickness also not bad. If you want I can provide editable STEP file and G-code, but you have to add additional cost.

Thanks,Mahbub