It shouldnt be to difficult to make a fuel chamber with a wick just like tiki torch.
Thats what they do for the Olympic torches.
There is a fuel chamber with a large wick that runs the length of the hollow shaft. at the end the wick joins a diffuser and turns the liquid fuel into a gas and burns.
The diffuser keeps a steady flow of fuel to the flame allowing for a slow burn of the liquid fuel in the chamber.
Its not a traditional torch but it will last longer.