The link in the comment above is a collection of firmwares. Drivers can in essence have hotlists for additional filtering or be given access to communication w

The link in the comment above is a collection of firmwares. Drivers can in essence have hotlists for additional filtering or be given access to communication with an ink chip by the firmware, but AFAIK downgrading a driver doesn't work because what has really happened is it updated the firmware. A driver upgrade can also never be sufficient for blocking copying on a MFP printer, a standardized net print protocol as you mentioned or using open source drivers either on Linux or under WSL.