The flickering of the unlit headlight is difficult to fix, the real fix is not to have momentary glitches in the power. Truthfully, the most sure fix would probably be to add another roller or two to the dummy. It's possible that you could add a slightly more involved circuit to "buffer" the power to the headlight and add a slight delay to it powering on. I'm thinking along the lines of an electrolytic capacitor after the initial current limiting resistor and a resistor across the LED. This would keep the capacitor discharged when that headlight is not on, and if a momentary power glitch came and a quick burst of power was applied, it would take a finite amount of time for the capacitor to charge enough to allow the LED to light.
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