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Workaround for two devices with the same IP address on an airgapped network which is using an unmanaged switch where DHCP isn’t an option

So I have two IP cameras and a PC running Fedora 30 on a local network connected together using an unmanaged switch.

The two IP cameras have the same IP address by default and for reasons I won’t go into I can’t access the admin interface to give them different addresses. The switch doesn’t have DHCP (being unmanaged) so I can’t use that to change the IP addresses. I could install a DHCP server on the Fedora box but I want to avoid that.

I have tried to set up a workaround by adding static ARP table entry’s on the Fedora box for different IP addresses pointing to the MAC addresses for the two cameras in an attempt to allow me to connect to both of them at the same time. I am clearly missing some important detail as this approach isn’t working.

Is there any way for me to get this setup working without either setting up DHCP or changing the IP addresses on the cameras themselves. Hacky solutions are acceptable.