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A speaker is a microphone in the same way that a bicycle is a motorbike.

You don't need any mods to make a speaker act as a microphone... Just like an LED doesn't need any mods to be a light sensor

Not to the driver/microphone, but you do need to mod the circuitry it was attached to. And amplifier isn’t magically pre-amp.

I've tried it many times with many kinds of headphobes and it was always plug and play without any modifications.

Same with an alternator... Pretty sure it can be used both ways... The circuit can do both if designed right... That's childs play

When we were kids, it was common knowledge and cheaper to use headphones as a mic. Just plug headphones into mic jack and they work as mic.