I looked into this years ago (500 miles after buying my bfgs from cheapest place i could find) when i sliced a sidewall open. Now i have a cool coffee table on my deck, and only buy tires from discount now with full road hazard. I get a new tire every 6 months or so between my vehicles. Buuuut discount seems to be wising up and keep adding more exclusions to the warranty...
Bottom line, buy a new tire amd make a table with the old one