Eeek! A tricky one. The salad is normally pre-prepared which is a no no. Plus you don't know how long the meat has been sitting there for. So no, from a shop.

If you were absolutely desparate, my work-around solution, would be to get a meat only kebab from a reputable high turnover shop, nuke it before you eat it and add your own freshly prepared salad.

HTH