I'm probably the wrong person to ask about this, but you asked!
What you are building is essentially what Tiago Forte calls a "Second Brain". He has an entire book around Second Brain, as well as the one on PARA.
Ironically, I've found myself using Second Brain less since using PARA because PARA ends up solving my needs without it.
As an example, this week I received a letter from the tax authority where I live. I took the letter, scanned it, and placed it in my PARA/2 Areas/TAXES/2023 folder (since it was in relation to my 2023 taxes). I used a descriptive filename that included what the letter was about and the date.
I didn't need second brain to process the tax letter- what was important is that it was stored quickly and easily, and that I can retrieve it later if need be. I also don't need any complex tagging or keyword systems- the folder and filename help me find the relevant documents, and it takes no more time than adding lots of keywords. I know because I've tried more complex systems, and they ended up being more trouble than they were worth.
But more importantly, I'm not tied to any specific service or software. I'd never use a program that requires me to upload my most sensitive data to a third party service. It would put my data at risk and it would also mean that if the company were to change its business model (like Notion did) or had a breakin, or went out of business, my data would be at risk.
That's why I don't advocate for Second Brain services that do this, even ones with lots of cool features.
I would love automated integrated voice notes (vs what I do now which requires a bit of cut and paste) but the benefits don't outweigh the extremely high cost to me.
Sorry!