Look, you are saying many things that can work in theory, but in practice all LEDs I have seen that cost reasonable money dim using PWM and have detectable flicker.
I know "good LEDs" exist but if we are talking a few dozens of dollars per good photography-grade LED fixture then we are at a point where the savings compared to running a dirt cheap regular bulb approach zero or even go negative. At least in reasonable time periods, maybe such good LEDs are cheaper in the very long run but that's not for sure (faulty units exist) and even if it was I probably wouldn't even live that long.
I know "good LEDs" exist but if we are talking a few dozens of dollars per good photography-grade LED fixture then we are at a point where the savings compared to running a dirt cheap regular bulb approach zero or even go negative. At least in reasonable time periods, maybe such good LEDs are cheaper in the very long run but that's not for sure (faulty units exist) and even if it was I probably wouldn't even live that long.