How to exclude a category from showing in the kicker or footer

Hi, I am back to ask the great experts here! Currently I am using the kicker and footer info items to display the categories for each post. I am using the shortcode %categories-linked for this:

%categories-linked(', ')%

So each category gets a link in the kicker/footer, separated by a colon. Basically, this is what I want. However, there a a few categories I am using solely for technical reasons (images are displayed based on this category by using css and the like). I dont want these "ugly" technical categories to show up in the list of categories displayed by %categories-linked%. Is there a way to do that?

I have tried using css to apply "display: none;" to the category links in question, but it seems they dont have a special id or tag. All I came up with is:

.category-total-mg div.post-footer a:hover, div.post-footer a:link, div.post-footer a:visited, div.post-footer a:active {
display: none;
}

But of course this removes ALL category links in case the category is "total-mg", and not just the specific link to category "total-mg". Hope I am making myself clear...