the handbrake thing is a coincidence,they do do that.
odd that your rims/tyres are touching near the bumpstops tho...a small spacer would do the trick maybe,...although im not a fan of them myself......or a well aimed clout on the offending panel???.sounds drastic,but no diff really to 'rolling' arches.
i must say tho,for me the aim of fitting after market/different rims,is to improve the 'foot print/track' of the car,not reduce it.it sounds like you have narrowed the track of the car,even with the wider 5j wheels.
front drive rims are more inset,because of the need for more space to engineer front drive and get a decent turning circle,but 126's are old school,and benifit most from outset rear drive rims.......most second hand rims on the market now are from front drive hatches..or XI9's(uses front drive power train mid mounted)........its getting harder to get 131/132/124 type offset rims now