as already said... tyres are not designed to be run on there sidewalls. less grip, more stress on the tyre and a risk of the tyre comming off.
You seem to compare the danger to driving at 80mph on the mway?? Yet the tyres are designed to run like that, and cope. (look at the speed rating on the tyre)
and im running 7.5j
tyres, brakes and suspension are the only thing keeping all of us out of ditches, upgrade by all means but improve.
Better as said to take your wheels to a show and change them there.