Just put a bigger spacer on, i dont see the problem. ET43 with a 10mm spacer bringing it out to 33 you wont have any rubbing issues! my winters are 6.5 with 205/55 balloons on et38 and theres about 4mm caliper clearance and could easily space 10mm.
And excuse my ignorance but changing the pads wont move the caliper?? its bolted in place the piston is the only thing that sinks further into the caliper. You can shave a few MM of the caliper aswell as mentioned, id just space the wheels. Will look better for it aswell!