Access to CUPS from remote IP

we have a fleet of raspberry Pi 3 on
Each Pi has a printer set up with CUPS.
We would like to be able to access the CUPS GUI from the public IP so we can manage the printer settings remotely.
The problem is that the public IP only supports port 80 that we are already using to run a node.js web server.
Cups default port is 631.
Anyone can suggest the best approach to achieve this?
Many thanks

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Hey enricopenzo! I was working one a very similar project and was able to get CUPS working on port 80. You can check out the config file in my repo or just clone it if you would like -

Also, released a how-to on Medium as well.