Used that method with my zook! what caused the bend was what got rid of the bend :D just did the same thing in reverse
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Heat, stretch, and hammer, and, maybe cut a vee-fillet or two and weld back when to dimension. Cut out any buckling this way. You really do need a fairly accurately flat slab and screw jacks to set the frame up and ensure accurate measurements. Engineer's levels are a big help but a couple of protractor sets can make do if proper levels are not available. Long straight edges and steel rules are almost essential. Not a difficult job if you have the facilities. Do you know a blacksmith?
Do you think it would be worth cutting the radiator support cross member out, try straightening each rail, and then welding it back in again?
that will work but will be painful if there is any twist in the chassis OR if one of the rails has compressed back.
I have seen someone cut all the outriggers and cross members off to straighten one out before welding them all back in.
you will also have to watch your welding procedure, as that alone can distort the chassis...
Serg