Best way to share a printer between networks?

Small office ~20 people.

There are two companies sharing space, they already have a big Ricoh MFP with one NIC. The two networks are physically segregated, one using a Sonicwall TZ600 (IP range is 172.16.10.0 /16), the other a basic little TP Link router with 192.168.2.0 /24. The printer is attached to the larger Sonicwall network. Both companies have their own separate internet connections, the TP Link company is just getting DHCP from their local ISP. The Sonicwall company has public IPs.

My question is what is the best way to share this device between networks. Both companies want full usage of it, meaning the ability to scan as well as print. My thought was take the Ricoh out of the switch (it is currently on the 172 network), give it its own port on the Sonicwall and its own network and create an access rule allowing traffic from the 172 network back and forth to the Ricoh.

Then, on the TP Link router, set up a 1-to-1 NAT and assign an IP for the Ricoh. Plug the TP Link LAN port into a Sonicwall LAN port and repeat the access rule process, allowing traffic from the 192 network to reach the Ricoh.

If I'm imagineering correctly, this will allow both networks to send and receive data from the Ricoh but will not allow the 192 network to see the 172 network.