Hi, I have the same problem, shocking craftsmanship/design and generally reflective of Bavaria, don’t give me German Engineering. Having got that of my chest, if you have a local Toolstation or similar you can buy a right angled chuck for a drill. You will also need stub drills. It is not easy. I had one chain stripping bolt seized the other came loose eventually. When drilling out I created a bit of a mess of the bolt and surrounding metal. If I had to drill out both I was going to have to re-drill and tap.
Behind the front cabin bulkhead decorative panel there is a hidden solid wooden bulk head. As a last resort I was going to cut a hatch in this bullhead and then reinforce it by stainless steel bracing. When the decorative panel is back in place it will all be hidden.