Maybe some of the high heat grill paint, or that VHT caliper paint.
Ya, I have used this stuff on the bowl of a red 18 I restored last September.
So far, no issues. And that kettle has been used nearly every weekend since I put it into the rotation. Cold weather and all.
I didn't use any on the lid. As Brian said, it should be fine since it's the lid.
EDIT: It wasn't a perfect match, but pretty damn close.