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It's going to be hard to find something to fill all those requirements at the same time. Makes it harder when you can't control what apps the other users are using for texting. Sending group texts anonymously is probably a hard stop due to the potential of something like that being used for mass spamming. Likewise with sending mass messages and having the user only see it as coming from you and not include other users. Most providers block that kind of thing for the same reasons as above. You'd likely need to use some individual messaging app for stuff like that and require all the users to use the same thing. I don't see any way of making this work like you want while anticipating the other users will be using normal simple texting capabilities.
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