A toothbrush for cleaning jammers to help stop them slipping on muddy ropes, which occur however good the rigging. Cycling shorts to protect against groin rub. Muddy ropes normally end up cutting hands. Obviously don't over do the amount of gear needed. Here experience does help and it is best to talk to a previous expeditioner that has been in this situation.
Camping equipment is also important.
Storms will blow large frame tents down so use an alternative type of tent or improvise, for example tying a large tarpaulin sheets over a big rock crevice. What fuel will you use -paraffin for example is unobtainable in Spain. Don't forget either medical arrangements nor suitable insurance. Food and many small items are best bought in Spain. This saves on carting vast amounts of gear which could easily be bought over there.