I have put the blade in water with the tang sticking out and heated it up with a propane torch till the metal turns from brown-blue-gray, let air cool then bend in vise.
I have also clamped the razor in a big vise with the tang sticking out and used the vise as a heat sink. The advantage here you can bend when still hot.
Mike Blue and Butch were the ones that told me these methods.
Charlie