Yes, I was able to get it working like this:
These are examples.
If my server had 5 ip's with 2 dedicated / exclusive for a site, Hiawatha conf needs to be:
1.1.1.1, 1.1.1.2, 1.1.1.3
1.1.1.4 is exclusive IP for website, 1.1.1.5 exclusive for website
In init.conf for Hiawatha in binding part add
Interface options for 1.1.1.1-3 ONLY
in domain conf use interface for corresponding IP
It works. But on fixweb/cleanup init.conf is rewrote.