Not quite sure why you are looking for a compatible HMI to connect to the C200H if you already have the Siemens panels you love. The OP270 will connect.
Onron Hostlink allows for a lot. The OP270 you are tryingwill work, however that model has been discontinued.
We are using the MP270B for several different Omron models, the C200 may also need upgrading.