I picked up a couple of used kerosene (hurricane) lamps for a few dollars each at a local charity shop.
These should look good somewhere in my Halloween display.
It was then pulled through into the wick adjuster area.
A two core cable was then pulled back up to the top.
A 5mm yellow flicker LED was roughed up and poked through the top of the wick.
The two core cable was would around then soldered to the LED.
The flicker looks pretty good even with the fairly clean glass: