Why not? The point is that a blinking light triggers awareness because it indicates movement against a background (even a stationary blinking light) and our brains are wired to focus on movement against background. Two blinking lights out of phase sends a triply strong message.

Based on what you posted, a reflective strip on the back of the leg of your shorts might be good, too ... question is, how far are you willing to go? paint a strip of reflective paint down thew back of your leg each night?

Blinkie on the left-side shoe is a really good idea--if it works for the rider.