Solved using the Zamzar File Conversion API Service
With this service (which can be called up in almost all programming languages) we were able to convert from PDF to PPTX and output a perfectly identical file (page formats, styles, etc.) to the PDF with the possibility of editing it (it does not generate image slides but fully editable slides).
We just released a developer library/api for annotation product Markup Hero. It's quite slick and easy to implement. Here is a demo of it in action with Notion (this is just a demo, Notion hasn't integrated it... yet). But we have a handful of SaaS companies integrating. Quite flexible and clean.
30 Second Video Demo: https://youtu.be/miB3yD1xlTI
The whole product is available for free through the community license if you qualify (less than 1 million USD in revenue).