I will say it again, buying half his rights for 4-5m is a pretty good deal, I would do it in a heartbeat. This guy is only getting better after every game, his dribbling, pace, long shots and his movements add much to this very predictable squad.
This would be the best solution. Lets not overpay and let's not leave him to go to another team and do miracles. He at least deserves another chance...