CXF client only sends XML with UTF-8 encoding

Issue

I have a CXF SOAP client, but the endpoint can only understand ISO-8859-1 encoded messages, and I can't figure out how to configure my client to do that. It seems CXF will only send messages using UTF-8 encoding. How can I change that?
The XML headers from the soap request, show the below encoding as UTF-8:
```
<?xml version="1.0" encoding="UTF-8"?> 
```

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