Went out in the shop to see what you could do with a pullmax and a bead roller. Here are some picture of a piece of 20 gauge ss, 2-1/2 wide spacing on the flutes and 5/16" deep. Just used some existing die I had. Only did 2 flutes.
Was a little hard to take pictures because it is the mill finish and shiny.
Think it can be done this way but it would take 3 people. One to feed, one to guide and hold it steady on the discharge end. Eight foot long pieces would be a challenge.