Can I send digital signals between two routers in this scenario?

Maybe this isn’t the best sub and I don’t know much about these topics (I don’t do PLC) but here’s my dilemma:

I need to bump some motors for I/O checkout. I have to send the signals from one control panel to another 500 ft away. I was going to run an Ethernet cable with a switch between the two panels, but that’s not allowed.

Now I’m thinking that maybe I could buy 3 routers, hook one up to the main panel, one at the second panel, and another halfway as a sort of repeater or relay to send these signals wirelessly.

Could this work? If so, what are some challenges and considerations come to mind for you?

Thank you.