thanks for replies! in order not to rub i would need my feet moved away from cranks by about 5mm. rafletcher: i use speedplay frog cleats and time alium cleats on another bike (no squeak due to a different type of shoes, but still rubbing a bit). they both don't have lateral adjustment. i didn't get on with shimano spds, had them unclipped unexpectedly and didn't use since.
looks like the simplest solution is to install 1mm washers between the crank and the pedal spindle and put some grease/oil on the inner side of the shoes. the spacers suggested by tatanab would be great if they were 5-10mm, but understandably this can not be done. top solution would be 5mm longer pedal axle.