How to claim BCC/BCH having BTC in MultibitHD without having a seed, but having a password?
Unfortunately there is no easy way to do that. MultiBit does not allow you to export private keys and they use their own implementation of AES to encrypt the wallet files so no third party tool (like bitcoinj' wallet tool) can be used to extract the private keys. All you can do is modify the MultiBit source code and run it yourself in order to dump the private keys to a file.