I don't know about any ready-to-use modules, but I built something like that with event handlers. First you initialize your wibox as usual. Then make it invisible:
your_wibox.visible = false
Then add the signal handler for showing it to the tag(s) on which it should be visible:
your_wibox.visible = tag.selected
This triggers, whenever the
selected property of the tag changes, so the wibox' visibility changes with the visibility of the tag.
I don't think, that putting that into a module could make it much shorter.