Cloud server printing to a non-windows Thin Client

Have a client that is using a cloud based server/desktop solution (server 2012r2). This solution utilizes a 'remote desktop gateway' and also thin-print (which is really only good for windows clients). There is no VPN here, so the ip of the server will not match the IP range of the LAN

They all have thin clients (non-Windows), mostly Wyse units.

None of the devices have printers locally installed.

I've been told the only way to do this is to do NAT so that each printer we want to setup on the new server is forwarded to a static WAN IP in the office. I've been told to use a different port for each printer.

 As a test - using their watchguard firewall-  I setup SNAT for one printer showing WAN to internal IP
In firewall rules, I created from ANY to the SNAT I just created allowed on port 11900

On the server, I installed the printer using standard TCP/IP port of 'WAN IP':11900.

This didn't seem to work.

Anyone have any ideas on how to set up the server side that would have each printer going to the same WAN ip address, but using different ports? Does the RAW port need to change from 9100 to 11900? IS the arbitrary port # of 11900 not a good one to use?
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AA095927Author Commented:
additional info/clarification.

I am able to setup ONE printer to print from outside the LAN using port 9100.

Because I have 12 printers, I need to setup these up using different ports.

I've tried every combination of raw ports, ip address (with and without the port in the address) and nothing other than port 9100 will work (which means I'd only be able to set up one printer).
AA095927Author Commented:
was able to solve.
found that the wan ip would be listed as the port's address, the raw port would be changed to whatever I wanted to change.
then on firewall, allowed traffic on said port, but had to then translate that traffic to the internal printer ip and to send it on port 9100. traffic on another other port internally would not get to printer.

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