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The problem with that ingenious idea and the metre long things with scratchy ends is that it stops the cyclist from filtering or just going close to stationary cars. Mind you, there are plenty of people who don’t seem to understand the difference between a cyclist passing a car with only inches of room, and a car doing the same to a cyclist.
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I have often envisioned something similar, only it would spray blood. Hopefully triggering the thought sequence "ohgodthere'sbloodohgodwhodidIhitohgodI'mintheshitohg..eh..oh sweet relief I didn't kill anyone, I never want to feel like that again, I'm giving those fucking cyclists a wide berth now"
Get a small diameter pvc pipe about a metre long, at the end attach a key, bolt said pipe to pannier rack.
Anyone who passes dangerously close gets a nice score down the side of their car with nobody but themself to blame.
Also ride away quickly when this happens