Just as hint, select all flights for compensation, then you can see miles, only select the shortest business class flight (or economy if you dont have short business flights), in the next window. This should provide you with the cheapest point options. Should cost you less then 50euros depending on available flights. 20-30 euros should be the goal, but depends on details.

(larger packages will lead to better results, but as you only need 10 it depends a bit)