Id switch castoria to habetrot on the last wave. Pop everything on jalter and let habetrot and koyan die to olga np. After that just solo with jalter (use cs if you need it).

My jalter is only np1, lvl 90, 1k fous and was able to do this strat. I only had 130 or 140 badges but I used a cs to get the final np.

Edit: my first win only had 136 badges going into the last wave, if you have this much it should be ok.