How as an instructional designer do I get someone to develop a needed feature?

I work for a university that records hundreds of hours of the live lectures for students to view later (in echo360). We have the cheap option of course for the title II audio descriptive text requirement that is coming up: make sure the lectures describe each image when they change slides or the very very expensive option: 3rd party transcription. If we can just get some sort of presentation software (or add on) that automatically reads the alt-text imbedded in the images, would that not be a simple rather cheap solution that would cover us when not dealing with specific requested accommodations? It appears nothing exists. Tell me my idea is stupid so I can move on.