Rivals: possible to get both red and blue player?

Hello,

I was wondering if it’s possible to obtain enough red and blue tokens to get both players? I tried to get as much tokens as I could, by playing the challenge mode thingies and doing a lot of the exchanges. But right now I am at 299 red and 168 blue, needing 400 of both for the final reward, and it seems I am not going to make it.

Is there any other way to get more red and blue tokens? Otherwise I have wasted a lot in those exchanges. (Which would be very much like EA always rolls…)