We were one of said Lemons cars. The kink will be fine as long as everyone is mindful of how on the edge people will be there, and how much of the track is used up taking it properly. The kink IMO is not a good place for a high power car to try and get alongside a low power car. If everyone is respectful it won't be a problem.
The only type of 'obstacle' I would consider safe to put there would be to basically move the apex to the left, making it more of a forced 90 degree turn to force breaking earlier on the straight. This would also slow down 12 though, which is where I see a lot of fun things happening :-) .
I chicane near the kink would probably end in repeated disaster as fast and slow cars try and funnel in from the fastest section of the course along side each other.