Custom Dynamics (same company that makes the electronic load equalizer for turn signals) makes a headlight flasher unit. I have one installed on mine that works during the daylight hours only and can be shut off by flashing the high beams. It's legal in all states and makes the bike very visible by drawing attention to it. In fact, I often have cars that pull over to let me by thinking I'm a cop. I have the bike set up so I can turn off the lights, flash the lights, have them work normal and at any time I can flash the high beams with the factory switch.
My primary visibility concern now is getting slammed in the ass end from someone not paying attention. I plan to install the tail light flasher sold by Easter Beaver when I can spend money again if I still have the bike.