I would also be tempted to consider ceramic coating IF I had access to a competent firm. I have had quite a few different heads coated over the years and am a ‘believer’ I guess.
However, I’m the one who posted about the stuff flaking off in my last motor build, and the pot with the worst flaking was also badly scored, whether or not this was coincidence, or the ceramic medium caused the scoring, I don’t know.
It’s the first time I’ve seen such a failure though, hence my intital comment, if it’s applied correctly, it is sound. If not, well, it’s not!