This sadly has become less useful with the increase in headphone usage by pedestrians.
Possibly some kind of laser beam thing that sweeps the ground in front of you might work?
That's what the TFL bikes in London do[0]:
"The Blaze Laserlight is fixed to the cycle frame and projects a green cycle-shaped image onto the ground around 6 metres ahead of the cycle."
[0] https://tfl.gov.uk/modes/cycling/santander-cycles/blaze-lase...
Before I did my licence I was a firm believer in "no earbuds on the road", but after a few driving lessons I got so used to taking in the traffic situation with eyes only that I quickly converted to an earbuds all the time cyclist. A few years later I stopped driving so much and my cycling reverted to ears-always-open without me even noticing.