I’m not sure this is helpful to the questioner, so I will say that
as someone else mentioned, E6000 is good for dissimilar materials,
and Goop is good for plastics.
But the mention of rivets in the context of plastic reminded me of
something that some may find interesting, and that I would never
have thought of. Rivets can be made of the cord for a weed-whacker,
using a hot knife or a soldering iron to flatten the cord into a
rivet. This can be a very cool way to attach found objects to metal
and the like. It comes in various colors and thicknesses (though
generally very large quantities) and anyone you see using one of
these machines is pretty certain to let you have a few inches to
Tip of the hat to Tara Macintosh.