Will 2 strands of worsted weight yarn knitted together work as a suitable sub for bulky weight?
I am guessing it probably would, but the best way to be sure is to knit a gauge swatch, especially if it’s for a garment.
I asked this question once upond a time and I was told that 2 strands of DK or sport would probably be a better substitute as worsted most likely would be too thick. But, as Marria stated, check the gauge to see what works for your particular pattern.
They may be a bit thicker than bulky, maybe chunky/super bulky. But you can certainly try it out and see what you end up with.
How tightly you knit, the needle size and the types of stitches can also affect it.