After a short thinkabout I and trial I found there's NO WAY to fix it at the track. Even after towing the car home for the night between the quali and race I found it would take at least 6-8 hours to fix it normally (my flat bottom is NOT exactly service friendly).
Fixing took just 2 hours or so and most time was spent protecting the windows and removing seat and belt.
After now servicing isn't that bad anymore

I'll need it next time when I ditch the iso stuff.
PS! In the first picture the cure for sloppy gearbox mounts is visible as well.