Paperless NGX vs ???

I'm stuck in a bit of a rut for work and trying to help out a department. We're going through a massive cash flow problem that we will see the other side of. There is zero budget for this, but I have spare kit.

The problem is that Legal have pulled all paper archives for all of the projects for the past 20 years of operating and need them digitally stored. Right now, we have a company runner scanning in a document to email, who then saves it off to a folder structure and renames it. The structure is on SharePoint, but the scan is image, not even OCR'd.

I have discovered Paperless NGX and wonder if this would be a better option for fast ingest. I can host on prem easy enough, either on a bare metal or VM. It looks like it can SSOd via many different options.

Any input would be great before I just go ahead and do this. I'm after pros and cons, alternatives, etc.

Thanks.