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You mention USDA food grade a lot. I will wager that’s not the case for a lot of grey market vapes. It will be at most, “best effort” food grade with the occasional “whoopsie not sure what was in that drum before we used it” thrown in to keep you on your toes.
They should be able to put memtest on the boot partition and then break to an EFI shell on boot and Ioad it manually.
There will be a bit of swearing and googling required but it’s doable in a way that doesn’t mess with the current boot arrangement.