This goes back to the saying, when you're only tool is a hammer, every solution is a nail. If you have a corrosion issue, set the nutsert with some red loctite on the flange and use some anti-seize on the fastener, or even blue loctite to keep water out of the threads. Just because one struggles with simple effective solutions doesn't make them bad for everyone else. I have more solutions within arm's reach to put threads in that drilled out hole. The welder, hardware cabinet and 1000's of fasteners are within spitting distance and I'd walk past all of them to the nutsert bins because I'm smarter than a nutsert.