UI element for excluding group or indicating priority

I'm currently trying to come up with a better design for a UI element that is used for either excluding a certain field, or indicating it's relevance in a search. The current solution does not yet have the option to exclude and uses a set of three radios, ranging from 'desired' to 'required'. My main issue is that 'exclude' is a bit of an outlier and does not fit well in this (continuous) range. All possibilities I have come up with so far have downsides in my opinion:

• Radios for all 4 options suggest continuity
• Slider: same story
• Using a select element hides other options and requires more clicks (which would be annoying for this frequently used control)

I wonder if you know of other creative solutions to this problem?