I just want a basic SMS program for Twilio

That's it. I would like to be able to use my longcodes and to have the ability to select unlimited keywords. I don't necessarily care about punch cards, polls, client logins, or anything else. I have an online software purchased from here that doesn't work, and a wordpress plugin from here that doesn't work. Just the basic ability to integrate with Twilio and send basic text messages. It can be a plugin, or a platform online, whatever. Does such a simple system exist? I don't want to pay hundreds of dollars for things I don't have interest in using currently. I need to prove to myself that I can market SMS services locally and develop a market first, so I'm looking for a minimum viable system to get me started. Later I can transition to all of the bells and whistles if I can start getting clients. I've been looking and doing a ton of research, and I can't find what I'm looking for. Great platforms exist, for sure, but they are more than I want or need currently. I realize that there is something called OpenVBX and that you can develop things off of that, but it is over my head and would take a lot of time to develop something from where I am right now as a novice to such.

So, does anyone here know of a simple, easy to use system whereby I can build lists by keywords and schedule basic messages as needed with minimal cost, using Twilio?