You could add a template modification for 
message_macros.
e.g.
Search type: 
Regular expression
Find: 
/<xf:userbanners .+ \/>/isU
Replace:
	
	
	
		HTML:
	
	
		$0
<xf:if is="{{ $xf.visitor.isMemberOf(123) }}">
    YOUR LABEL
</xf:if>
	 
 
If you choose this method, you have to replace 
123 with the 
user group ID of the user group the users with the badge/label belong to.
You cold also work with profile fields, that only administrators can change.