Need to drop ethernet connection during emergencies in factory - how?

Hey guys, I work in a manufacturing business. We have a kluge right now where we have a Cisco switch (3650 8 port I believe) spitting out MM fiber to a media converter to copper. I had no idea wtf this thing was for until I talked to our Process Engineer (we have been working together for upgrades).

We have HMUs (fancy PCs that are embedded and have no interface slots in sealed cabinets, monitor and CPU included) that are pressurized with nitrogen. If the seal breaks, power is killed to the PC. It also drops power to the media converter. This is to get rid of any potential spark.

The building has solvents that are extremely explosive that could potentially be vented inside, so to be certified, this is the setup.

I really don't like the media converter idea. We can't run fiber to the PC because it's an embedded system with only copper ethernet ports on it.

I was thinking maybe we just run fiber and stick the media converter in the cabinet.

Anyone come up against something like this and has a more elegant solution? We don't want to drop the entire network switch either in the emergency (phones, other PCs run on it).

Thanks!