There is a reason this hasn’t been done before.
Just because something is possible, it doesn’t make it easy. Yes, off the shelf apps can be adapted on a shoestring to build a bespoke tech platform. But it takes time, is frustrating, and causes multiple moments of profound self-doubt.
There are many bulk SMS message services in East Africa but none that enable two-way dialogue with people. None that also allow for complete control of survey design & targeting. None that enables tracking of an individuals’ change in attitude & behaviour over time. And none that enables aggregation of all individual responses so that group wisdom can emerge.