You really shouldn't wax any vinyl, especially matte. Just wax around them. There's a reason some people like to opt for paint protection film over the stripes. You might also get some waxy buildup on the sides of the stripes if you're not careful, try to tape that off. If you do wax them, which some people do without any immediate adverse effects, be sure to just test a small area first to see how it reacts. It's possible it might dry white or discolor the stripe itself. I think just using vinyl protectant on it is probably the safest idea.
Might look into that wax then. I was going to be applying a couple of small matte black stripes, but wasn't planning on waxing them at all. They were cheap enough to just replace when they get old so it wasn't a huge deal.