I've set up a Pinboard account, which I've used in the past for a different fandom's kink meme, and am working on populating it. This will take some time, but as it will be searchable by tag (once I remember how to enable the setting!) with up to four tags at once (as far as I can tell from the site info), I think it will be reasonably user friendly.

Edit: It's also going to mean we can use the character tags we avoid using on Tumblr.