The code was designed especially to prevent what you are trying to do:-( The problem is that C2 is only running one instance at the boundary to C1, the CIST. So for each of its ports leading to C1 it can only block all vlans or forward all the vlans.
If C1 is root for certain vlans, C2 will have to block one of its port to C1 for those vlans. This means that C2 can only block ALL its vlans to C1, considering the rule stated above.
On the other hand, if C2 is the root for the CIST, it will need to put both its ports to C1 in forwarding, which means put ALL the vlans to forwarding on both ports.
You clearly see the contradiction, and that's what the inconsistency you are getting is trying to show.
Why do you need C1 to be root for some vlans? Is that for some load balancing issues? Because you can achieve load balancing without having C1 being the root.
The only solution to your problem seems to have C2 run PVST considering your constraints. It would be much better if you could move C1 to MST and have it participate in the same region as C2 of course...
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