As for the white contacts for Toph, you are aware that any contact that covers your pupil completely will also render you blind, right? You'll need a buddy to lead you around the con. If you're fine with that, they can be found for like 70 after some searching for phrases like "white-out contact." I thought there used to be lenses that were like the white-outs but had a pinprick pupil, so they weren't totally accurate but neither were you totally blind, but I can't seem to find any.
As for bare feet, you could try something like Dance Paws but it would end up being up to the discretion of the person calling you on it as to whether that would count as barefoot or not. I would say just get some flesh colored or appropriate-looking (like what she would wear if she DID wear shoes) flip-flops and just step out of them for pictures. Just make sure to step a few feet away so they're not just sitting right there at your feet in the picture, you know? That same goes for bags, just set them down (within your eyeline, of course) for pics but out of frame.