You can try mass tag replacer (http://dev.goose.im/tags/), maybe? It's worked pretty well for me. You hit on "go" button on the main page and allow it to make changes to your Tumblr. Then enter "redbrunja" in the blog URL, "honey-love" in tag to find, then put in a replacement tag without a hyphen then hit "replace". Keep fingers crossed then voila! Either it wouldn't work (but no skin off your nose 'cause it doesn't work now anyway) or you'll get the functionality of that tag back.