@wtb
Network Acoustics ENO comes with a 30 days money back guarantee. The only way for you to know if adding a ENO provides audible improvements between patch panel and K40 is by trying it. If you don’t hear any audible improvements, send it back. Every system is unique so results from passive filters and switch greatly varies. I would suggest you to try ENO first and then approach the Ethernet switch upgrade.
IME, fibre optic benefits are not fully realized unless your router and server (K40) are optimized for optical network.