A cheapskate option
https://www.ebay.co.uk/itm/2-LED-SILICONE-MOUNTAIN-BIKE-BICYCLE-FRONT-REAR-LIGHTS-SET-PUSH-CYCLE-LIGHT-CLIP/251741513527
Used to put these on my earlier phantoms.
They would be reasonably visible after dark if you had an idea where it was, especially in a tree or something.