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Double them up, add an esp into the dingdong box, detecting the sound sent to the speaker or probe somewhere else in the circuit, or even use a small mic if you don’t want to pull it apart.
Or it’s probably a 433 mhz signal from the button, sniff that and basically you can have your own receiver
there’s someone who’s done the 433 mhz approach here https://community.home-assistant.io/t/433mhz-wireless-doorbell-monitor-on-an-esp/818738
or here https://reuben.science/posts/making-wifi-doorbell