That job is easier then easy. You can use Duramix, it works well, or any of those plastic products. However when I do bezels like this, I always sand everything down, then I glue everything together with CA Glue which I describe as Super Glue On steriods. It literally fuses the 2 pieces of plastic together. From there I would use duraglass filler to get it nice and even and OEm looking.
From this point, sand down that section that is being worked on. Mask it off, then primer with a High Build Primer, then wetsand the primer with about 400, then paint
Easier said then done
Check out my threads for pictures and tips.