I had the same problem, and I was able to drill out the old screw. I made a drill guide from key stock and clamped it to the pod (I used double-sided tape to tack it in position before clamping):
I was lucky and the screw drilled out cleanly. The tip of the screw got pushed out by the drill bit as I was almost through:
Here you can see the drill marks at the butt end of the screw-tip:
I cut a groove along the length of a new screw and used this to chase the threads after I drilled out the old screw. The threads in the pod still work just fine, but are a bit loose.
I don't know that you need to remove the pod to do this, but if you do pay close attention to the arrangement of washers, spacers etc. where the pod mounts to the car. Getting it all back together is a "challenge".
Try to use the correct size replacement screws. These are metric self tapping screws to ISO standard 7050 (successor to DIN 7982C), size M3.5 x 16 mm. The original screws are stainless, replacement screws should be as well. You can use ISO 7051 / DIN 7983C screws instead; these are oval head vs. the original flat head and look oh so pretty.
If you use some other similarly sized, non-metric screw, they'll have to cut new threads as they go in and you risk twisting off the new ones.