You could paint the edges black with a nice marker or acrylic paint and then seal them with a clear drying glue or sealer (something like a Sobo glue or acrylic sealer from the craft store) and then spray the fronts and backs a couple of times with a clear acrylic sealer spray. That should make them pretty durable. Some of those acrylic sealer sprays are very durable. It would also allow you to choose the surface gloss you want to have.
Another option since you mentioned laminating, is I've had luck using half a lamination sheet to laminate something a little thick on just one side and then trimming it and using half a sheet to laminate the back side. You do need to run it through on something that's either non-stick or some trash paper so that you don't jam up your laminator. It's a little tricky but doable. But I've only done that for PNP projects and I've never tried it on manufactured components.
Edit to say the first option would probably be the easiest and quickest by far with less risk to your components. It's always good to test it out on something first if you're able.
Another option since you mentioned laminating, is I've had luck using half a lamination sheet to laminate something a little thick on just one side and then trimming it and using half a sheet to laminate the back side. You do need to run it through on something that's either non-stick or some trash paper so that you don't jam up your laminator. It's a little tricky but doable. But I've only done that for PNP projects and I've never tried it on manufactured components.
Edit to say the first option would probably be the easiest and quickest by far with less risk to your components. It's always good to test it out on something first if you're able.