Curious if anyone in the community is well-versed in solutions for front-end business SMS UIs?

Our key criteria is a desktop application that has basic contact management, leverages Twilio for its back-end (pass the API key + account SID to connect), can use an existing 10DLC registered business phone number + campaign for messaging, and is low- or no-code to setup.

Some automation, such as message scheduling or conditional messaging on response would be nice-to-have but is not critical.

We've examined a few possibilities that don't seem to quite fit our needs: - TalkyTo: good Twilio integration, however, it's an iOS app (not desktop), lacks contact management, and doesn't seem able to connect to an existing 10DLC campaign on Twilio (creates a new one). - OpenPhone: Seems like the perfect solution at first glance, but our efforts to discuss the feature set and our needs with our contact at the company have not been fruitful. - Sendblue.co: Again, seems like a perfect solution, but we've had some challenges connecting with Sales and the cost/conversation means it would be quite expensive relative to our business model, which would create a strong incentive to switch to a different vendor as we scale (we'd like to avoid this). - Front: Could work, but far more than we need (full CRM system) and quite expensive.

Are there any other potential solutions out there that the community can recommend? For this specific vendor, we're highly prioritizing a path of least resistance.