Is it possible to create, for instance, a box model hack while using in-line CSS?
For example:
Keep in mind that IE 6 needs the box model hack in quirks mode but not in standards mode. IE 5 and IE 5.5 need the BMH all the time.
So if you're in standards mode, you'll need to use something like the original voice-family hack (which targets IE 5.X and not IE 6). If you're in quirks mode, any old IE <= 6 hack will do.
(The content of your question suggests to me that your page renders in quirks mode.)