I don’t see how you could incur a carrier’s wrath. You could spend a few minutes on google and find many carriers talking about it. They get paid.
As for your idea that they will block it, you’ll have to cite some sources for that. I used this for the first time over twenty years ago and had zero problems, and you can still do it now. You’re inventing problems now.
I’m not going to reply anymore because your requirements are extremely unclear and I’m not really here to provide free tech or developer support. This is just a fun place I occasionally contribute to.
If nothing else works, build it yourself. It wouldn’t be too difficult to get something basic built up and you’re good at inventing problems so you might be great at solving them. Have a nice rest of your day and best of luck with your project.