Welding to the torsion beam would weaken it, and welding to other parts either would cause them to fail or the weld would fail same as the sway bar. It needs to redirect the force in another direction, without exceeding its own torque limits or the limits of the parts it's fastened to or the hardware holding it on. The material has to be stiff enough to be effective, but not so stiff that it just snaps in two or rides like a brick.
Unfortunately, it's not an easy problem to solve...
View my fuel log 2017 Mirage ES 1.2 automatic: 42.3 mpg (US) ... 18.0 km/L ... 5.6 L/100 km ... 50.8 mpg (Imp)