The prints are, close up, those color blobs coming from how printing was done back then

Oh right, the CYMK (cyan, yellow, magenta, black) “blobs.” That process is still used in some publications I believe, like newspaper comics.

IDK how it could be made into more vectorial drawings

Something like this might work. We could try that, and or the other two tools I posted above.

I’ll post some of them somewhere.

Sounds good.
Let me know svp, and I’ll help test out.
Ciao!