You are worried about taking off your bindings out of fear of "fucking them up" yet you intend to fully deface your ski with sand paper -- potentially sacrificing the structural integrity. And this, of all things, you're ok with?!
I probably wouldn't proceed with your level of understanding.
That being said, I too have an old '13 pair of A-Bangs of which I am currently sanding down.
A few things to note.
The ink from the graphics penetrates deep. You'll start exposing the first layer of fiberglass before you remove all traces of the graphic. This will give a slight inconsistency in the wood grain you are trying to obtain.
The wood is a real bitch to sand too. Use heavy grit and work your way up to fine grit.
I'll be finishing off the ski with a darker stain and poly sealant. This will help hide some of the graphics I couldn't remove completely.
Good luck!