Options to roll-out 70+ printers/150+ users to office

Hey Experts.  I have a mid-sized (150'ish users) gov agency that uses many printers, roughly 70.  This is due to the nature of our office (legal) and the sensitive material printed which can't go to a "public" printer.  

To make this design work, I created AD groups (ie, LEG1 and LEG1-D) that we could assign users to and when they would login, our login script would run and install printers based on group membership.  The -D made the printer the default which was the trigger for the script to move on to the next section.

However, the latest MS patches that were released broke our printing design and in the short-term, I had to uninstall KB5005031 and 5005103 so that I could get printing running again.  

Many recommendations are to use GP's to assign/install printers which is a great concept but I'm not sure I completely grasp its application in all environments.  If I understand correctly, I would create a GP for the printer (LEG1), assign users to it and the GP would install that printer.

Based on that idea, would I need to create 70'ish GP's?  Surely that can't be the case and I'm not understanding how to use GP's to deploy printers.  

What I'm looking for here are 1) suggestions/guidance of putting a methodology in place that will work with the latest KB's and 2) if GP's can satisfy #1,  how to use those but not if it requires a GP for each printer.  

Thanks in advance for your help!