So you want to do this...
Upgrade from AE101 'large' rotors (158?x22?) to twinpots + machined down super-strut rotors (161?x25?).
Dont do it....
Not worth the price it costs + requires a cert.
I would get new front rotors (I'm guessing the old ones are well worn) and decent pads, bleed out the system fully and live with it.
so this corolla has ABS you say ... another reason I wouldnt be messing with the brakes and up-setting the bias.
Is the wear even left caliper to right caliper, is the wear even inside to outside caliper, like the others I'd be looking at sticking slides (caliper should be free floating) or a piston thats a little rusty.