This would lend itself to stencils pretty well though (one color, no islands), especially with a touch of spray adhesive on the back. I've done the symbol from one of the more common solarpunk flags, and getting the blank spot inside the gear positioned would be a little finicky if doing graffiti.

You'd want to bridge the corners there, to make it all one piece, if you wanted to be able to put it up quickly. I was just painting a laptop so I had plenty of time to fuss with it.

Honestly stencils are best for that.