Targeted promotional campaign

Hello BHW users. I need your advice. I need my text to get to 1500 agents , that use whatsapp. The text is not BlackHat themed , it is a real estate offer that they would appreciate , since they get the cut if they sell it. The problem is , I don't have Whatsapp Business account and I think managing it is too big of a headache. Most of services offer managing my own numbers , which in most cases needs to be Meta business verified. I built a whatsapp registration flow , starting from mobile emulator , SMS OTP API handling + web linking so I could automate message sending , but otp sms providers are not stable either. Most of them sell used / blocked numbers.

Does there exist a service that would send a message from their own number pool? Meaning the sender user could be from any country , any name ,etc. Sender users don't even have to be the same. I would include my number in the message so they would contact me , therefore I don't care about sender profile.

If you know such service or if you have better solution , hit me up. Thanks