I would think that you could use your existing rollers as they are. I assume they are powered?
Just feed in your bar and put a gentle, regular curve in, then turn the bar the other way and adjust the rolls to neutralise the curve and it should come out relatively straight.
I have done this in the bonding machine shown and it works succesfully, however if the bar is twisted, then it becomes a little more difficult.
Two or more passes may be needed
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