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.
A draw wire was poked down one side from the top.
It was then pulled through into the wick adjuster area.
A two core cable was then pulled back up to the top.
After a bit a stuffing around, more of the plan started to emerge.
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 LED can be adjusted up and down using the original wick adjust knob.
This height looked about right.
The flicker looks pretty good even with the fairly clean glass: