I once converted a wood burning stove to gas. I made a burner out of 3/4 inch black pipe, capped at one end and a row of 1/8" holes drilled along both sides (about 1" apart).
It worked fine and something like that should be easy to make for your smoker.
Dr. Mark (STL)
Ph.D. (honorary) Bovine $hitology
A thin line separates paranoia from an acute understanding of reality.