Not exactly the same, but wouldn't it be possible using a VOIP service like Google Fi to have/generate a large number of phone numbers? Give each contact their unique number, so if you ever get spam called you can detect where your number leaked from.

(If it isn't directly possible, I'm fairly sure using some sort of iot telephony servive would help getting hundreds of legitimate numbers. Now only to build a cell interceptor to funnel them all to one phone!)