Block Outgoing SMS Messages

A family has asked me to prevent one of their children from sending text messages to certain numbers. (Please don't suggest they simply take away the phone or delete contacts.) I have seen many text message blocking applications, but it seems they can't block outgoing messages. As far as I know, Android is the only operating system that might allow blocking outgoing text messages. I've seen some old threads on XDA that suggest blocking outgoing text messages is impossible, but I doubt this is true today. I can think of two ways to do this:
1. Monitor the default text message application and prevent messages from being sent. This answer on Stack Overflow seems to suggest it's possible, although it seems the phone must be rooted: stackoverflow.com/a/20885911/1325179. (I haven't posted enough on XDA to include a link apparently.)
2. Replace the default text message application with a custom application that utilizes a parental control system. Apparently newer versions of Android allow for other applications to take over the text messaging role, and this new program could prevent messages from being sent to certain numbers.

So does anyone know of a program that already uses #1, #2, or anything else that might block outgoing text messages? I'm hoping a final product exists. Thanks.

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