It escapes me why anyone would not want to have hazard flashers on their motorcycle. They are such a good thing. Though modern bikes have begun featuring them again, they're still kind of hit and miss. They're not common.

Here is an easy way and one that is not ugly. Shown here is a Chinese on/off switch sold all over the Internet, for example on Amazon. Add a #552 flasher unit, a pair of diodes, some wire and shrink tubing and you're all set.

You will notice I depict this circuit as bypassing the keyswitch. That's actually the way to give this circuit the most utility. However, if you'd rather have key control, connect to your Honda's black wire.