NTLM in SOAP headers

Hi everyone; trying to use SoapUI to help with some application security stuff as Burp Suite and other security proxies/DVSes do not support SOAP very well. Does anyone have any advice on how to set up NTLM authentication at the *header* level in SoapUI? (Without changing the service being called, of course.) Message level security seems to be the sticking point for many people over the years and I don't see any clear resolution at the usual locations. Thanks for any tips or walkthroughs.