Might be workable, with enough effort

Requires a template file moved to your theme folder. It does not work with the twenty-fourteen theme “out of the box” and the tweaking was not worth it. The form and the layer-switching links were off to the left “underneath” the left nav sidebar. Might be a great plugin, but can’t tell without investing a good bit of development effort. Should have basic functionality for average users (I’m a developer, and not willing to take the time to get it working). Looking elsewhere.