I looked at the ZMPT101B, not sure if it will work at that low a voltage.

Did some quick looking at the ideal diode modules available on Amazon, but they were just schottky drop or so. Sparkfun had one that might work. Ideal diode is definitely the right sort of thing, just have to find one ideal enough. If I can find the right one, it should work.

I’ve been looking at precision rectifier op amp circuits. Even half wave gets me what I need.