No, you should start with spring rates first, then choose your sway bars to complement the springs. Sway bars only help with body roll. Spring determine dive, pitch, ride quality and other factors that sway bars can't control.
Either way, having extra stiff front suspension to compensate for sub optimal roll center, and then adding an extra stiff RSB to try to get the car to rotate before it understeers is like putting a band aid on top of a band aid. Why not just start off with a roll correction kit (which reviews here have stated increased turn in and grip and less understeer), softer front suspension (again, less understeer and more grip and better ride quality) and then determine which RSB you need?