I've only ever had one TSA agent realize that I didn't have a cartridge razor in my dopp and confiscate my blades. Since that happened (but before I became an enormous beardo), I've brought only the bare minimum blades needed for my trips packed edge on to the x-ray scanner and left the butterfly in my shave kit but opened to show it was empty.

I imagine a safer and less obstreperous way might be to just buy an injector razor for when you travel.