If anyone comes across this and has the ability to submit an Idea, it may be worthwhile to request group messaging (SMS/MMS). The client is switching to RingCentral claiming they offer it as a solution. I did find an article on their site that makes it sound like the user can enter multiple recipients and the software will send a separate message to each of them. To me that isn't much better than just copy/paste but in this case the client prefers it so there may be others out there as well.