The biggest visablity issue with bicycles is rear profile
visiablity not side. That said I say skip these spoke
do-dads. Simple reflective tape on the forks & frame
is better. Also try to make yourself more visiable from
the rear with a Lime Green reflective vest or a slow
moving vehicle triangle at the rear.

You can use either zip ties or hose clamps to put a
bottle cage on any bike.