Setting a profile picture with php

I want to extend /global/forms/uploads and add a button so I can launch a form that will gather some information from the user, pass that to the OpenAI image endpoint and return an avatar image.  I would then want to set this image as their profile picture.

Before I get started I want to know if it's possible for a custom plugin to do this.  I know that the stock photos extension works by opening a form, browsing for pictures and then selecting one.  Am I likely to encounter any limitations with this approach?

Any advice would be most appreciated, thanks.