You might keep looking and find what you want. I suspect that an old-time tobacconist shop is your best bet. Find a place that deals with Zippo lighters and handles the wicks if you can buy Zippo wicks you can tease them apart and recombine them to create the wick configuration you need.

Many places that sell oil lamps have wicking that could be reworked to get what you need.

I keep a roll of all-cotton twine around and as-is it makes a good wick for a lot of quick and dirty applications. a metal jar cap, fat or oil, and a short length of all-cotton cord and you have a lamp. I have also braided it, or teased it apart and braided/plaited the smaller components, to make larger ones.