Rather than using the
tiddler="title" attribute, I suggest that you use the same tiddlyLink="title" and refresh="link" attributes that TiddlyWiki uses for links in wikified HTML. Then by also using the classes tiddlyLink, tiddlyLinkExisting and tiddlyLinkExisting, you'd be able to take advantage of TiddlyWiki's dynamic processing of link styles according to the existence of the target tiddler.