I couldn't make it work using one line. If I understand correctly this is consistent with how action-setfield works. The action-setfield widget uses the wiki.setText function to overwrite the old tiddler by creating a new tiddler with the same name as the old tiddler, just with the new field appended to the tiddler data. When you set the value of an existing field the new value takes the place of the the old one in the created tiddler, so when you change the title field the new tiddler is created, but since the title of the new tiddler is different, the old tiddler isn't affected. When you set multiple fields using a single set widget this process is repeated once for each field in sequence, but each time it is starting out with the tiddler given by the $tiddler input. So you can do this in one line IF you have the order of the inputs such that the title field is given last, AND you want the changes to affect the original template tiddler as well, because the fields are added to the template tiddler one by one, and then a new tiddler is created. If you have 'title=newtitle' first than none of the changes after that are applied to the new tiddler, but they are applied to the template. Unless you want to change the template this probably isn't a good way to do it.
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