Oh I see, circular but flat. Could be done, technically, with tons of increases, but double knitting looks awkward/too fussy and the way I’m thinking of, if it worked at all, would definitely not be worth the bother.
If you don’t want to spend more money, remember that circular needles can be used in place of straights, so if you bought circs, you would not be buying items that would only be used rarely.
Another possibility is knitting a long strip and sewing it into a spiral? You would be much better off with that if you learned how to knit backwards - from right needle to left needle - so you wouldn’t have to turn every 4 stitches or whatever.