Hey guys! Great to see all this excitement around my feature
Just wanted to let you guys know that instead of hosting the OSDX file in a .zip file, you can link to it directly. If the server it's on is configured to return .OSDX files with the appropriate "application/opensearchdescription+xml" MIME type, the install will happen automatically when you click on the link!
Most hosting providers provide a configuration UI to add file extensions and MIME type associations. If you can't find it, check the help documentation (probably just search for "MIME").