I needed to replace some old taped-on rear reflectors (required for the roadtest here in Japan), and to avoid drilling holes in the body, I came up with this simple bracket design for rear reflectors.
For anybody who might want it, the file download for 3d printing is on Thingiverse: https://www.thingiverse.com/thing:6100783
It clips itself to the rear bumper's mounting bar on a VS (40mm x 6mm fit), and can be pointed up or down, to mount a variety of rear reflectors for bicycles. Hope it's useful for somebody!