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You can attach a small permanent magnet somewhere on your bike's frame and it will trigger the ground loops. They're a common add-on for motorcycles, too.

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that doesn’t work for the majority of these sensors as they rely on inductance

In that case, simply install a chunk of steel under the bicycle - 150kg or so should be sufficient.

I found steel rims to almost always work as long as you put it right over the middle line. In CA they often paint a little bike where you need to put it.

A simulated inductance circuit would do

Is there a way to visually tell what kind of sensor loop you're dealing with?

I can verify that a magnet makes the difference for my steel-framed e-bike, but really there's only half a dozen lights in town (Gilroy, CA) that I frequently use.

As far as I know all of the sensors that are embedded in the pavement use inductance.

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