I am not aware of a BIOS pack, interesting idea though.
I believe most people would avoid that like the plague. Because no matter how many disclaimers you posted many idiots would still blame you for their "bricked" devices. When in reality they were either broke to begin with (which is why they are flashing them) or there was a power surge or brown out or other "environmental" issue that caused the flash to fail. Too much liability associated with firmware and BIOS upgrades. (It's always someone else s fault, so naturally one blames the guy who gave them the file .
In our case if a driver is not found or if the wrong driver is installed it's no big deal. If someone Bricks hundreds of dollars of hardware they are gonna be looking for someones blood, and are not going to take the responsibility themselves. That is my guess why you don't see anyone doing it. It's hard enough to get people to treat you well when you 99.9% of the time take care of them, let alone when there is a high probability they are going to have a failure.
Good luck!