Hi Gary, thanks for the reply. I agree that it's not the content that matters. Maybe it wasn't totally clear from my description, but I don't feel I was particularly mired in content during this experience and similar others. That's why in a sense it doesn't really seem like it was actual disgust. I wasn't obsessing about how disgusting this all was. Sensations, movements and utterances consistent with disgust were happening.
I also worry sometimes about fulfilling the stages "on purpose," which of course isn't a problem if it happens and is after all what we want to do. The reason I worry is about the possibility that I'm fooling myself and might be subconsciously acting out the stages to feel like I'm an accomplished meditator. This "what if I'm faking it" feeling is of course just another cluster of sensations to investigate and note

Even now it's conceivable that I've only been experiencing knowledge of the three characteristics, but my A&P event candidate and other clues lead me to more confidently think I'm in the dukkha ñanas. Practice should sort this out. I hope