Steve, if you only plan to do one-off radius bends and have an absolute "must-have" English wheel handy, then Jaro's suggestion makes perfect sense.
Apart from a rubber wheel, as suggested, you could use a 4" go-kart slick as the rubber wheel and full radius rollers made from UMHW plastic or similar to roll in shape. This method produces seamless, beautiful curves and does not stretch the metal with any significance. I like the fact that varying the psi in the tyre contributes to how forming takes place. That said, it's all about personal preference, availability and most importantly, COST!
My workshop is littered with fantastic machines I've built over the years but seldom get to use - causing storage misery as they are sadly too valuable to toss and pretty worthless to sell, consuming prime workshop real estate to no real benefit.
Finding a storage place for a square foot's worth of rubber and plastic wheels is a viable option and won't cost the earth.
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Manny
Remember that the best of men, are only men at best.
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