Thin Wheel Reflector for Road Race Bike

This is a reflector for my daily used workhorse (one of my old Race Bikes). Taboo breaking, normally nobody put a reflector on race spokes, but this one is very thin and it's all for my safety in long winter nights.

The wheels are Shimano RS501 with bladed spokes.
The profile of the spokes is elliptically and they are about 1.75 mm x 2.75mm.
Front: 20 spokes, radial
Rear: 24 spokes, double crossed
The angle between the spokes (for example 1 to 3) is 360°/20*2= 36°.
Lukily the angle bet