5mm will bend with a helper, like a shifter, or if you want a fold line use 2 bits of flat each side with 2 shifters, if you want a deeper bend than that, a hammer and dolly (slightly curved block) or a vice.
Strutt braces by nature should be hard to bend, mines hollow and would be difficult to bend without a crease, a pipe bender may do it if the profile is right.